Angkor Wat, in Cambodia, is one of the most famous sites in the world. The temple complex at the center of an ancient city was built to honor the Hindu religion more than 800 years ago and later became a Buddhist temple. Its builders used more than 5 million stone blocks from a nearby mountain. Each block weighs up to 3,000 pounds. How did the builders get the blocks to Angkor? Scientists have recently found evidence of hundreds of canals, or waterways, in the area. The canals likely helped carry the blocks the 23 miles to the site.

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