We tend to go gaga over hotel pools; we've been known to swoon over the pools at the W Hotel Ft. Lauderdale, Cavo Tagoo in Mykonos, and Hotel Joule Dallas, not to mention the rooftop pool scene at The London West Hollywood. Now we've just learned about the enormous pool at the Alfonso Del Mar resort in Algarrobo, Chile, and we're itching to check it out. National Geographic's Intelligent Travel blog reports that this 20-acre, 66 million-gallon pool stretches half a mile. For the record: an Olympic-size pool is only 164 feet long and holds 660,000 gallons. "Built for $3.5 million by the Chilean firm Crystal Lagoons, which aims to open an even vaster version in the Egyptian desert, the pool has delighted resort guests and curiosity seekers since 2007."