Twelve towers, 10,000 rooms and 70 restaurants, plus helipads and a full-size convention center: That’s the plan for Abraj Kudai, a complex in Mecca, Saudi Arabia, that’s set to become the world’s largest hotel by room count when it opens in 2017. Designed by architectural firm Dar Al-Handasah, the $3.5 billion site is currently under construction and will stretch across 1.4 million square meters. The towers will house 10,000 hotel rooms. Currently, Las Vegas is home to the world’s largest hotel in terms of the number of guest rooms.