With partying going on from dusk until dawn from the 40 million tourists visiting each year, it's little surprise Las Vegas in the U.S. has a plethora of luxury hotels.

But you might still be surprised to learn that six of the 10 largest hotels in the world are found in Sin City. And out of the top 20, 14 are located in the U.S.

Topping the pile is the MGM Grand Hotel and Casino. Housing 6,852 rooms and suites, the site is very popular with the rich and famous, including Prince Harry.

The top 20 largest hotels in the world, according to the number of rooms and suites

The MGM Grand Hotel and Casino has the largest number of rooms in the world with 6,852

Lavish: The MGM Grand is a popular resting place for celebrities

The MGM Grand is located by the Arena giving show headliners the perfect spot to rest

It is located beside the MGM Grand Arena which, with a capacity of over 16,000 and known for hosting first class shows and sporting events, means the hotel is always busy.

First opened in 1993, the hotel has consistently moved with the times, and has now added two luxury 'wings' to the existing development.

The 'Skylofts' are 51 two-storey lofts located on the top two floors, and the The Signature at MGM Grand are three distinct towers each with 576 suites; most suites offering private balconies.

The front entrance of the main hotel features a 100,000-pound bronze lion statue, located at the corner of Las Vegas Boulevard and Tropicana Avenue.

The 45-foot-tall lion, perched on a 25-foot pedestal, is the largest bronze statue in the U.S.

The lion is framed by LED screens, water fountains, Atlas-themed statues and mesmerising landscaping.

Few hotels outside the US broke into the list, but The First World Resort in Genting Highlands, Malaysia (left), came second and the Sheraton Macao in China (right) was in 13th place

The First World Hotel in Malaysia is as colourful as it is imposing

This Sports Resort forms part of three main resorts at the Walt Disney World Resort in Orlando. The property came third in the overall list

Matthew Walls, vice president of Hotels.com EMEA told MailOnline Travel: 'Year on year we see an increase in popularity for hotels in Las Vegas, and it is clear that the larger ones are hugely popular with travellers.

'When looking at our Hotel Price Index data we can see that even throughout last year Las Vegas was one of the top destinations to witness an increase in average hotel room rates, as the specific hotels are aware of the demand for luxury and larger hotels to stay in.

'For many, a larger hotel allows for a range of activities on the holiday, with more to keep them entertained, while also providing more conversation and holiday memories for when they return home.

'With such high competition to draw in large amounts of travellers, the hotels in Las Vegas are clearly looking to be grander and larger than others in the world. We have seen that when celebrities holiday, or even take up residence on the Strip, that the demand to visit Nevada increases further.

'Prince Harry famously stayed in Vegas several years ago, causing hotel searches to the area to increase a staggering 123 per cent overnight, while Britney Spears' residency sparked further searches to increase 52 per cent.'

Russia's sole entry in the top 20 is Moscow's Izmailovo Hotel, fourth in the rankings

Fifth is the Wynn Hotel in Las Vegas, flanked by a raft of boutique shops and stores

The Wynn Hotel is full of art, bringing the outside inside

You might be forgiven for thinking you were in Egypt on approaching the Luxor Hotel in Las Vegas

The Luxor sits in sixth spot in the rankings of the world's largest hotels

Runner-up in the world's largest hotel list is the First World Hotel in Genting Highlands, Malaysia.

With 6,118 rooms and suites, the colourful hotel is as imposing as it is enchanting. The hotel also houses a 500,000 sq feet indoor theme park, a shopping mall and lots of dining stops, with 11 restaurants.

Completing the top three with 5,524 rooms is the Disney All-Star Resort Hotel in Orlando, Florida.

The Venetian Hotel in Las Vegas is luxurious and comes complete with a river and gondolas

The architecture inside the Venetian is rooted in Italy. The hotel features in eighth position on the list

You might be forgiven for thinking you've gone back in time with a stay at the medieval-looking Excalibur Hotel and Casino on the Las Vegas Strip - ninth largest hotel

Las Vegas' Aria Resort and Casino, completes the top 10 with 4,004 rooms and suites

The inside of the Aria is illuminated with a multitude of colours

The resort comprises three separate sites, a Sports Resort, a Movies Resort,and Music Resort.

The Movies resort features a giant Herbie The Love Bug car, and lots of enormous playful puppies from 101 Dalmatians.

The Sports hotel has five themed areas – American football, baseball, basketball, tennis and surfing, and at the Music hotel, the buildings are decked out with huge saxophones, guitars and drums.

The flower red fountain and blue sky above Caesars Palace hotel in Las Vegas

The scene greeting visitors to the Bellagio Hotel in Las Vegas

The Circus Circus Hotel and Casino in Vegas has 3,774 rooms

The flamingo at The Flamingo Hotel and Casino in Las Vegas. This came in 16th position with 3,565 rooms

Leon Markovitz, who designed the infographic and carried out the research, told MailOnline Travel: 'The results are definitely surprising, not only for Las Vegas but for the US in general.

'But I'm curious about how often these hotels are at capacity, since Vegas is full of mega-hotels.

'Also, the MGM is the largest, yet it was opened in 1993.'

The Atlantis Resort on Paradise Island in the Bahamas has 3,414 rooms and takes 17th spot in the list

Hawaiian Villahe in Honolulu in Hawaii is another non-Las Vegas based hotel making the top 20, with 3,386 rooms seeing it bag 18th spot

The luxury hotel and casino Palazzo sneaks in to the top 20 in 19th, having 3,068 rooms and suites