1. Cancún Underwater Museum (MUSA)
What is it? A contemporary art museum that's entirely underwater.
Why go? A visit to MUSA is a truly unique experience. The museum comprises over 500 statues completely submerged in the Cancún National Marine Park's waters. The best way to see these sculptural coral reefs (which take the form of familiar shapes, like children and cars) is by snorkeling up close, but if you don't want to get wet you can also see them via a glass-bottomed boat.