1. Izmailovo, Moscow – 7,500 Rooms
The Izmailovo has a total of 7,500 rooms and it may take a while before any hotel can surpass such number. The whole unit is made up of four towers, 30 floors each. Each tower is given a name from the Greek alphabet – Alfa, Beta, Vega, and Gamma-Delta. Erected on a former Romanov land, this hotel is where the Olympic athletes were housed during the 1980 Olympiad. Flaunting a three-star rating, the Izmailovo Hotel is also located close to many tourist attractions.