10. Aria Resort & Casino 4,004 rooms, 61 floorsAria Resort & Casino is a luxury resort and casino located within the City Centre complex on the Las Vegas Strip. Aria consists of two curved glass and steel high-rise towers adjoined at the centre. It opened on December 16, 2009 as a joint venture between MGM Resorts International and Infinity World Development. At 4,000,000 sq ft (370,000 m2) and 600 ft (180 m) in height, it is the largest and tallest structure at City Center. Being strategically located the Resort is situated very loss to Marjorie Barrick Museum, the University of Nevada-Las Vegas, and the Las Vegas Convention Centre.  9. Excalibur Hotel and Casino 4,008 rooms, 28 floors (2 towers)The Excalibur Hotel and Casino is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada, in the United States. It is owned and operated by MGM Resorts International.Excalibur, named for the mythical sword of King Arthur, uses the Arthurian theme in several ways. Its facade is a stylized image of a castle. Until 2007, a wizard-like figure representing Merlin looked out from a high turret (since replaced by a figure advertising Dick’s Last Resort).It is the world’s most stimulating resort that has a magical castle and once you enter the hotel premises it takes you back to the mythical days of King Arthur. This distinctive property features 3,981 guest rooms, two swimming pools, five marvellous restaurants.  8. Ambassador City Jomtien, Thailand 4,219 roomsThe Ambassador City Jomtien is a large resort at Jomtien Bay, near Pattaya, Thailand, with "over 4,210 rooms”. Located about 8 km south of Pattaya, it occupies a 40-acre (160,000 m2) campus overlooking the beach and nearby mountains. It consists of five buildings that each contain 150 to 2,000 suites, plus eight restaurants, several bars and nightclubs, a convention centre, and a sports/fitness facility that claims to have Asia’s largest swimming pool. It is distinguished worldwide as "The Largest Resort Complexes” located in the middle of landscaped and private beach of Thailand. It consists of five buildings and each contains 150 to 2,000 suites, plus eight restaurants.7. Mandalay Bay the hotel 4,332 rooms,  43 floorsMandalay Bay Resort and Casino is a 44-story luxury hotel casino on the Las Vegas Strip in Paradise, Nevada. It is owned by MGM Resorts International. Five floors (floors 35–39) of the main hotel building are occupied by the five-star and AAA Five-Diamond Four Seasons Hotel Las Vegas. The top 3 floors (numbered as floors 60-62) are penthouses, with a penthouse lounge on level 62 for guests staying in the penthouses. Located at a distance of 3 miles from the airport it offers 20 restaurants, lounges, and cafés. Other entertainment facilities include 135,000-square-foot casino, an aquarium, the House of Blues concert hall and a live theatre.6. Luxor Las Vegas 4,408 rooms.  22, 22, 36 floors (3 towers)Luxor Las Vegas is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada. The 30-story hotel, which is operated by MGM Resorts International, features a 120,000 sq ft (11,000 m2) casino floor that includes over 2,000 slot machines and 87 table games. In the 2008 to 2009 renovation, it has a new, highly modernized and contemporary design and contains a total of 4,400 rooms, including 442 suites, lining the interior walls of a pyramid style tower and within twin 22-story ziggurat towers that were built as later additions.  It is named after the city of Luxor in Egypt. The 30-story hotel is operated by MGM Resorts International and it features a 120,000 sq ft casino and accommodation facilities provide 4,400 rooms. The structure of resort is built in pyramid style.5. Wynn Las Vegas 4,734 Rooms. 48, 50 Floors (2 towers)Wynn Las Vegas, often referred to as simply the Wynn, is a resort and casino located on the Las Vegas Strip in Paradise, Nevada. The US$2.7 billion resort is named after casino developer Steve Wynn The 614-foot (187 m) high hotel has 45 floors, with the 2,716 rooms range in size from 640 sq ft (59 m2) to the villas at 7,000 sq ft (650 m2). The complex also includes a 111,000 sq ft (10,300 m2) casino, a convention centre with 223,000 sq ft (20,700 m2) of space, and 76,000 sq ft (7,100 m2) of retail space. Together with the adjacent Encore, the entire Wynn resort complex has a total of 4,750 rooms. 4. First World Hotel 6,118 rooms,  24 floors (Tower 1), 28 floors (Tower 2)It is Malaysia’s largest hotel with accommodation of 6,118 rooms that offer comfortable and affordable facilities to the guests. The First World Café, the hotel’s coffee house, is also Malaysia’s largest, as it covers an area of 44,600 sq feet and can seat up to 1,338 guests. Below the hotel is a 500,000 sq ft (46,000 m2) plaza called the First World Plaza, housing shopping malls, arcades, foot outlets, Starworld Casino, and the Genting Indoor Theme Park. It has a mini stage for weekly performances (such as magic and music shows) at Time Squares, surrounded by a replica of the Statue of Liberty and an Oscar statue. Other attractions include the Watersplash Pool (an indoor water theme park for children), Genting Sky Venture (Asia’s first free fall simulator) and a Cineplex.3. The Venetian 7,117 rooms. 3 towers ( 52, 37, and 14 floors )The Venetian Resort Hotel Casino is a luxury hotel and casino resort situated between Harrah’s and The Palazzo on the east side of the Las Vegas Strip in Paradise, NV, United States, on the site of the old Sands Hotel. The hotel tower contains 40 stories and rises 475 feet (145 m). The Venetian is owned and operated by the Las Vegas Sands Corporation. The Venetian is (along with the adjacent Sands Expo Convention Centre and The Palazzo Hotel and Casino Resort) part of the largest five-diamond hotel and resort complex in the world with 4,049 suites, 4,059 hotel rooms, and a 120,000-square-foot (11,000 m2) casino. The location of property is strategic as it is situated at a distance of 4 miles from McCarran International Airport. 2. MGM Grand Las Vegas 6,582 rooms.  includes MGM (30 floors), Signature, Skylofts, and The Mansion HotelThe MGM Grand Las Vegas is a hotel casino located on the Las Vegas Strip in Paradise, Nevada. The MGM Grand is the third largest hotel in the world and largest hotel resort complex in the United States in front of The Venetian. The MGM Grand was the largest hotel in the world when it opened in 1993. It is now the second largest hotel casino located on the Las Vegas Strip in Paradise, Nevada and it boasts of having an accommodation of 6,852 rooms. The property provides recreation facilities like five outdoor pools, rivers, waterfalls, Grand Garden Arena, CBS Television City, and the Grand Spa. 1.Izmailovo, Moscow 7,500 rooms  4 towers ( Alpha, Beta, Vega, Gamma-Delta), 30-stories each. The Izmailovo Hotel is a group of hotels located near Izmailovo village in Izmaylovo District. The property consists of four buildings containing 7500 rooms, making it the world’s largest hotel by number of units.  It was built during 1980 Olympic Games and it consists of five towering modern buildings placed on the edge of Izmailovsky Park. It provides excellent business facilities that includes conference centre with 11 different spaces for corporate events.