4. Mandalay Bay
A 43-story luxury hotel and casino in Las Vegas, Mandalay Bay, was opened on 2nd March, 1999.
Owned and operated by MGM Resorts International, Mandalay Bay has 3,309 hotel rooms, 24 elevators and 135,000 sq ft casino.
It also has 11 acre pool area with three heated pools including a wave pool for small children and a lazy river with a small waterfall.
Just adjacent to Mandalay Bay, there the 1,000,000 sq ft Mandalay Bay Convention Center and the 12,000-seat Mandalay Bay Events Center connected to the hotel by the Mandalay Bay Tram.
It was ranked fifth largest hotel in the United States at the time of its opening.