You may think those Olympic sized swimming pools on TV during the summer games are impressive.  But, even the Olympic pool pales in stature to the mother of all swimming pools found at the San Alfonso del Mar resort in Chile.
This vast pool, which was recognized by the Guinness Book of World Records as the largest pool in the world, lies beside the Pacific Ocean in Chile. The pool measures an incredible 1,000 meters in length, covers an astounding 20 acres, has an enormous 115 ft deep end. Not surprisingly, the pool takes quite a bit of water to fill it. In fact, it holds a total of 66 million gallons of water. The seawater pool is drawing crowds from all over, if for no other reason than its massive size.

Check out a video of the world's largest pool.