Have you ever thought your backyard or public swimming pool was just too darned small? Maybe it'd be nice to have something a little bigger? How does half a mile long pool sound? What about a deep end that’s 135 feet? Yeah, that’s what I thought. The San Alfonso del Mar is a private resort in Algarrobo, Chile that boasts the world’s largest swimming pool. Not a bad tourist attraction. The pool is 0.6 miles long covering 20 acres in total. At any given time it contains around 66,000,000 gallons of filtered seawater from the Pacific Ocean.