Tonlé Sap & Siem Reap, Cambodia

Just south of Siem Reap lies Tonlé Sap, Southeast Asia’s largest lake.  Designated a UNESCO site, it harbors more than just an amazing array of animals.  Since the lake and connecting river reverse flow twice a year and it goes from empty to enormous depending on the season, local fisherman have formed an entire town floating on the lake’s surface, with schools, stores, and even an alligator farm.