Photos: Defining Moments: Our changing world MAY 20 -- LONDON, ENGLAND: A Chelsea Pensioner takes a photo in the Sentebale 'Hope In Vunerability' Garden on the opening day the annual Chelsea Flower Show. The garden is inspired by the Mamohato Children's Center in Lesotho. Due to open later this year, the center will will provide support to children living with HIV. Hide Caption 1 of 50

Photos: Defining Moments: Our changing world MAY 19 -- SYDNEY, AUSTRALIA: Taronga zoo welcomes the birth of a Western-lowland Gorilla. The species is under threat from poaching, hunting and infectious disease. As yet, keepers have been unable to get close enough to establish the gender of the new-born. Hide Caption 2 of 50

Photos: Defining Moments: Our changing world MAY 18 -- MELBOURNE, AUSTRALIA: The padlocks now seen on bridges around the world to commemorate a couple's love, has come to an end in Australia's second largest city. The council plan to remove 20,000 "lover's locks" because their weight is affecting the safety of Southgate footbridge. Hide Caption 3 of 50

Photos: Defining Moments: Our changing world MAY 15 -- BUENOS AIRES, ARGENTINA: Boca Juniors fans cheered their team on before the match against fierce rivals River Plate at the Bombonera Stadium. Hide Caption 4 of 50

Photos: Defining Moments: Our changing world MAY 14 -- FISCHBACHAU, GERMANY: Several thousand pilgrims, in traditional Bavarian folk dress, attend the annual Ascension Mass (Christi Himmelfahrt, in German) at an open-air altar. Hide Caption 5 of 50

Photos: Defining Moments: Our changing world MAY 13 -- CANNES, FRANCE: The red carpets await the feet of global celebrities ahead of the 68th annual Cannes Film Festival. The festival will open with Emmanuelle Bercot's "Standing Tall"-- only the second opener to be directed by a woman. Hide Caption 6 of 50

Photos: Defining Moments: Our changing world MAY 12 -- CHRISTCHURCH, NEW ZEALAND: Prince Harry helps the Student Volunteer Army hand out cupcakes during a visit to the University of Canterbury. The prince is in New Zealand attending events in Wellington, Invercargill, Stewart Island, Christchurch, Linton, Whanganui and Auckland. Hide Caption 7 of 50

Photos: Defining Moments: Our changing world MAY 11 -- SEOUL, SOUTH KOREA: A child looks a little sleepy while attending the 'Children Becoming Buddhist Monks' ceremony at a Chogye temple ahead of Buddha's birthday. The children will stay at the temple to learn about Buddhism for 14 days. Buddha was born approximately 2,559 years ago, and although the exact date is unknown, Buddha's official birthday is celebrated on the full moon in May in South Korea, which is on May 25 this year. Hide Caption 8 of 50

Photos: Defining Moments: Our changing world MAY 8 -- BERLIN, GERMANY: Flowers are laid down at the Soviet War Memorial at Treptower Park in Berlin to commemorate the end of the Second World War 70 years ago. Hide Caption 9 of 50

Photos: Defining Moments: Our changing world MAY 7 -- MOSCOW, RUSSIA: Red Square and Saint Basil's Cathedral stand illuminated during rehearsals ahead of celebrations to mark the 70th anniversary of the victory over Nazi Germany. Moscow will host a military parade among other events on May 9 to mark the occasion. Hide Caption 10 of 50

Photos: Defining Moments: Our changing world MAY 6 -- ROME, ITALY: Members of the Harlem Globe Trotters basketball team pose before the arrival of Pope Francis for his weekly general audience at St Peter's square Hide Caption 11 of 50

Photos: Defining Moments: Our changing world MAY 5 -- VENICE, ITALY: A visitor looks at 'The Key in the Hand' by Japanese artist Chiharu Shiota presented at Japan's pavilion at the 56th International Art Exhibition Biennale d'Arte, titled 'All the Worlds Futures'. The exhibition opens to the public on May 9 in various locations across the city. Hide Caption 12 of 50

Photos: Defining Moments: Our changing world MAY 2 - ATLANTIC OCEAN: HMS Lancaster, known as the 'Queen's Frigate', sends a message of congratulations to the Duke and Duchess of Cambridge on the birth of their daughter. Hide Caption 13 of 50

Photos: Defining Moments: Our changing world Fight of the century? – MAY 1 -- LAS VEGAS: It's one day to go before the hotly anticipated fight between Floyd "Money" Mayweather and Filipino legend Manny Pacquiao. The pair will go toe to toe to be crowned undisputed world champion at Las Vegas's MGM Grand on Saturday. The winner will walk away with a share of an estimated $300,000 purse. Hide Caption 14 of 50

Photos: Defining Moments: Our changing world APRIL 30 -- LONDON: Royalist Terry Hutt blows out the candles on a cake on his 80th birthday as he waits for a new royal baby at the Lindo wing of St Mary's Hospital. Hide Caption 15 of 50

Photos: Defining Moments: Our changing world APRIL 26 - LONDON: Spectators watch through the glass floor of Tower Bridge as runners in the London Marathon pass by beneath their feet. Some 38,000 people raced along the 26.2 mile course which ends on The Mall in front of Buckingham Palace. Hide Caption 16 of 50

Photos: Defining Moments: Our changing world APRIL 25 - AUCKLAND, NEW ZEALAND: People pin poppies to the Cenotaph following the Dawn Service at the Auckland War Memorial Museum on ANZAC Day, the 100th anniversary of the 1915 Gallipoli landings. Hide Caption 17 of 50

Photos: Defining Moments: Our changing world APRIL 20 - ROME, ITALY: People belonging to historical groups and dressed as ancient Romans attend an event to mark the anniversary of the legendary foundation of the "eternal city" in 753 BC. Hide Caption 18 of 50

Photos: Defining Moments: Our changing world APRIL 14 - IZBA, SUDAN: Women wait for their turn to vote outside a polling station in an impoverished neighborhood on the outskirts of Khartoum, the capital city. This is the first day of the country's presidential and legislative elections, which could see current President Omar al-Bashir hold onto his leadership for another five years. Hide Caption 19 of 50

Photos: Defining Moments: Our changing world APRIL 9 - GEORGIA, UNITED STATES: Spectators walk along the first fairway before the first round of the revered Masters golf tournament at Augusta, which begins today. Hide Caption 20 of 50

Photos: Defining Moments: Our changing world APRIL 7 - TOKYO, JAPAN: APRIL 07: Businessmen walk through an area used for 'Hanami' or flower-viewing parties on the final day of the cherry blossom season in Tokyo's Ueno Park. Hide Caption 21 of 50

Photos: Defining Moments: Our changing world APRIL 7 - OURO PRETO, BRAZIL: Girls dressed as angels take part in the annual Easter procession during traditional Semana Santa (Holy Week) festivities. Holy Week marks Easter celebrations for Catholics and Brazil holds the largest number of followers of the faith. Hide Caption 22 of 50

Photos: Defining Moments: Our changing world APRIL 2 - ZAMORA, SPAIN: Penitents take part in the "Procesion del Silencio" (Procession of Silence) by the "Cristo de las Injurias" brotherhood, during the Holy Week. Hundreds of processions take place throughout Spain during this time. Hide Caption 23 of 50

Photos: Defining Moments: Our changing world APRIL 2 - HIMEJI, JAPAN: Tourists take part in 'Hanami' or flower-viewing parties under cherry blossom trees in full bloom in the grounds of Himeji Castle. According to tradition during the Hanami season, people gather wherever cherry blossom trees are blooming and enjoy food and drinks often well into the night. Hide Caption 24 of 50

Photos: Defining Moments: Our changing world APRIL1 - MAE HONG SON, THAILAND: Shan, or Tai Yai, boys take part in a ceremony during the Poy Sang Long festival -- a Buddhist novice ordination ceremony of the ethnic group in the Shan state in Myanmar and northern Thailand. Young boys aged between 7 and 14 are ordained as novices to learn the Buddhist doctrines. Hide Caption 25 of 50

Photos: Defining Moments: Our changing world MARCH 31 - CHONGQING, CHINA: People take photos of the solar-powered aircraft Solar Impulse 2 at Chongqing Jiangbei International Airport. The aircraft, the first to be completely sustained by the sun's rays, took off from Mandalay, Myanmar's second biggest city, early Monday. It is the fifth flight of a landmark journey to circumnavigate the globe. Hide Caption 26 of 50

Photos: Defining Moments: Our changing world MARCH 30 - DAURA, NIGERIA: A young girl from the Hausa tribe waits while her mother joins a queue to validate voting cards at a polling station in an Islamic school. The station is in the home town of opposition presidential candidate Muhammadu Buhari. Votes were being counted Monday after Nigerians went to the polls to cast their votes in one of Africa's biggest elections. Hide Caption 27 of 50

Photos: Defining Moments: Our changing world MARCH 26 - KAZAKHSTAN: An Orthodox priest conducts a blessing service in front of the Soyuz TMA-16M spacecraft at the Russian-leased Baikonur cosmodrome. The new Soyuz mission is scheduled for March 28. Hide Caption 28 of 50

Photos: Defining Moments: Our changing world MARCH 25 - SHANGHAI, CHINA: Alexa Scimeca and Chris Knierim of the United States perform during the Pairs Short Program in the ISU World Figure Skating Championship. This year's competition is held at the Oriental Sports Center. Hide Caption 29 of 50

Photos: Defining Moments: Our changing world MARCH 24 - HYDERABAD, INDIA: An artist puts the final touches to statues of Hindu Gods Rama, his brother Lakshman, wife Sita and devotee Hanuman at a workshop ahead of the Rama Navami festival. Celebrations will be held on March 28, commemorating both the birth of Rama and his wedding to Sita. Hide Caption 30 of 50

Photos: Defining Moments: Our changing world MARCH 23 - PRIZREN, KOSOVO: Women attend a ceremony marking Nowruz celebrations in a prayer room. Nowruz, which means "new day", marks the first day of spring and the beginning of a new year in the Persian calendar. Hide Caption 31 of 50

Photos: Defining Moments: Our changing world MARCH 19 - NEW YORK, U.S.: Dancers from the junior ensemble of Alvin Ailey American Dance Theater perform a scene from "Hissy Fits" during the New York season. Hide Caption 32 of 50

Photos: Defining Moments: Our changing world MARCH 18 - PILISSZENTKERESZT, HUNGARY: The Northern Lights (Aurora Borealis) are seen above Dobogoko in the town of Salgotarjan. The best places to spot auroral displays are over the southern tip of Greenland and Iceland, the northern coast of Norway and over the coastal waters north of Siberia. Hide Caption 33 of 50

Photos: Defining Moments: Our changing world MARCH 17 - BALI, INDONESIA: Women offer prayers during a religious ceremony called Melasti. The ritual, in which the faithful carry a holy Hindu symbol to the sea to be purified, is performed ahead of the Hindu Day of Silence. Hide Caption 34 of 50

Photos: Defining Moments: Our changing world MARCH 16 - MANAGUA, NICARAGUA: A woman waves the Venezuelan national flag in front of a monument honoring Venezuela's late President Hugo Chavez. A march led by President Daniel Ortega took place to show solidarity with the country. Hide Caption 35 of 50

Photos: Defining Moments: Our changing world MARCH 13 - BEIJING, CHINA: A man naps in the corridor of the Great Hall of the People during a plenary session of the National People's Congress. The annual gathering is long on pomp and circumstance but short on legislative deliberation; while some voting takes place, the Communist Party's proposals are always approved. Hide Caption 36 of 50

Photos: Defining Moments: Our changing world MARCH 12 - GYERYONG, SOUTH KOREA: A military officer runs to his position during the joint commission ceremony of thousands of new military officers of the army, navy, air force and marines at the military headquarters. Hide Caption 37 of 50

Photos: Defining Moments: Our changing world MARCH 11 - RURUTU, FRENCH POLYNESIA: The Moerai School choir gather as they wait to sing the national anthem and raise the national flag during a visit by French Overseas Territories Minister George Pau-Langevin. This is the minister's first official visit to the South Pacific Ocean territory. Hide Caption 38 of 50

Photos: Defining Moments: Our changing world MARCH 10 - MUSCAT, OMAN: A Swiss solar-powered plane lands in Oman after it took off from Abu Dhabi early Monday, marking the start of the first attempt to fly around the world without a drop of fuel. Solar Impulse founder Andre Borschberg was at the controls of the single-seater for the 400-kilometer (250 mile) flight. Hide Caption 39 of 50

Photos: Defining Moments: Our changing world MARCH 9 - TEHRAN, IRAN: A woman walks past a wall bearing stains of exploded firecrackers from last year's annual fire festival, or Chaharshanbe Soori, held on the eve of the last Wednesday before the Persian new year of Norooz. The tradition follows the Persian solar calendar and will be celebrated this year on March 21. Hide Caption 40 of 50

Photos: Defining Moments: Our changing world MARCH 5 - TEL AVIV, ISRAEL: An acrobat performs during the Purim festival. The Jewish holiday commemorates the Jews' salvation from genocide in ancient Persia, as recounted in the Book of Esther which is read in synagogues. Other customs include sending food parcels and giving charity, dressing up in masks and costumes, eating a festive meal and public celebration. Hide Caption 41 of 50

Photos: Defining Moments: Our changing world MARCH 4 - PATHUM THANI PROVINCE, THAILAND: Buddhist monks pray and gather at Wat Phra Dhammakaya temple to participate in Makha Bucha Day ceremonies. The religious holiday marks the anniversary of Buddha's mass sermon to the first 1,250 newly ordained monks. Hide Caption 42 of 50

Photos: Defining Moments: Our changing world MARCH 3 - GAPYEONG-GUN, SOUTH KOREA: Thousands of couples take part in a mass wedding of the Family Federation for World Peace and Unification, commonly known as the Unification Church, at Cheongshim Peace World Center. Approximately 3,800 couples from around the world exchanged their vows in the wedding claimed by the Church to be one of its largest ever. Hide Caption 43 of 50

Photos: Defining Moments: Our changing world MARCH 2 - MANILA, PHILIPPINES: Revelers place colored powder on a woman's face as they celebrate the Holi festival in Pasay, south of Manila. The event is led by Indian nationals as they mark the spring occasion, also known as the festival of colors. Hide Caption 44 of 50

Photos: Defining Moments: Our changing world FEBRUARY 27 -- BARSANA, INDIA: Hindu men from the village of Nandgaon throw colored powder at each other as part of the region's Lathmar Holi festivities. During Lathmar Holi, men from Nandgaon -- said to be the home of the Hindu god Krishna -- tease women from neighboring Barsana -- the home of Krishna's consort, Radha. In response, Barsana's women "beat" the men with wooden sticks. Hide Caption 45 of 50

Photos: Defining Moments: Our changing world FEBRUARY 25 - BEIJING, CHINA: Women wearing traditional costumes wait prior to a show at Ditan Park temple fair during the Chinese Lunar New Year. Millions of Chinese are celebrating the Spring Festival, the most important holiday on the country's calendar, which marks the beginning of the Year of the Sheep in 2015. Hide Caption 47 of 50

Photos: Defining Moments: Our changing world FEBRUARY 24 - ATHENS, GREECE: Local revelers celebrate Clean Monday with a flour war, a unique, colorful event marking the end of the carnival season in the port town of Galaxidi, about 133 miles (214 km) west of Athens. The flour fight takes place at the beginning of the 40-day Christian Lent fast. Hide Caption 48 of 50

Photos: Defining Moments: Our changing world FEBRUARY 23 - OKAYAMA, JAPAN: Men wearing nothing but loincloths cram into the Saidiji Temple for the Hadaka Matsuri, or Naked Festival. In a tradition dating back some 500 years, those taking part battle to grab one of two lucky talismans thrown by a Shinto priest. The winners are said to be blessed with good fortune for the next year. Hide Caption 49 of 50