When booking a vacation, a hotel that has its own pool is always a big bonus. But a hotel in Texas has gone one step further, with a giant lazy river on its roof that takes 15 minutes to complete. The recently-opened 530-foot lazy river at the Marriott Marquis in Houston is formed in the shape of the state of Texas. It sits on the top of the 29-storey hotel, 100 feet above street level.

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