1. First World Hotel, Genting Highlands, Malaysia

Number of Rooms: 6,118

This brightly-hued three-star megahostelry has thousands of rooms and facilities to match, from meeting rooms and a business center to a cineplex and casino. And for all its Olympian size—there are (count 'em) 32 check-in counters—it’s just one section of the First World Plaza, which includes an indoor theme park and 500,000 square feet of shopping. The First World Hotel is truly a world of its own, not only because of its mammoth size, but also because of its global décor, such as the tropical rainforest at the entrance and the lobby that’s decorated in the style of a traditional Spanish courtyard. The hotel washes 40 tons of laundry a day.

For more information: First World Hotel