If you hate swimming in hotel pools when they get too crowded I don’t think you’ll have much to worry about here. The outdoor pool at the San Alfonso Del Mar resort in Chile is 8 hectares in size, 1 km long and is acknowledged by the Guinness Book of World Records as the largest in the world. It’s filled with about 250,000 cubic meters of salt water which, if you’re wondering, is roughly equivalent to about 6,000 standard backyard pools. It cost about $1.5 billion to build and maintenance alone is about $4 million a year.
Besides swimming (and lots of it) the pool also includes a temperature controlled indoor beach, sailing, kayaking, scuba diving and even a water shuttle service for quickly getting from one end of the resort to the other.