In preparation for US President Barack Obama's first visit to Berlin security across the city is on high-alert on Tuesday. The President along with his family will be staying at the Ritz Carlton Hotel in Potsdamer Platz; meaning all surrounding streets have been sectioned off with manholes being welded down by police.On Monday shops were not allowed to display merchandise outside and were also asked to keep the windows of their establishments closed. Reportedly, this was not to irritate snipers who have taken their positions on the roofs surrounding Obama’s accommodation.Of special interest to Germany and the world right now will be Obama's stance on the leak of information about US security surveillance intercepting information about citizens world-wide.The President is scheduled to land with Air Force One at Berlin's Tegel Airport after departing the G8 summit in Northern Ireland. Obama, along with his wife Michelle and presumedly his daughters Malia and Sasha, are expected to first arrive at 20:30 CET. At 10:00 the following Wednesday morning, Obama will dine with German President Joachim Gauck at Schloss Bellevue and receive military honors. At 11:00 he will meet with German chancellor Angela Merkel at her Chancellory, and the two will hold a press conferences at 12:30. The two will then have lunch privately.Press spokesman Steffen Seibert has said the most important topics the two will discuss include the conflicts in Syria, Afghanistan and the Near East. Another critical topic is anticipated to be international security in relation to the US surveillance program PRISM, which was revealed to have been collecting private data about people across the world, unbeknownst to all governments except the US.Meanwhile thousands of people are expected to gather near Brandenburg Tor to witness what many anticipate will be Obama's historic speech at 16:30. Following that he will write something in Berlin's "Golden Book," which is used by cities to allow guests of honor to record notes. Berlin's Golden Book was created in 1913, disappeared from 1921 - 1946 and mysteriously appeared again after the end of WWII.