Swim in the Blue Well/Poco Azul

Sitting at the bottom of a sinkhole under an unassuming  (but delicious) restaurant, this wondrous cave sets the record for the clearest blue cave in Brazil.

With an easy stairway hike down into the cave, this unbelievable adventure is family-friendly and full of photo ops. As a part of the neighboring Chapada Diamantina National Park, visitors are limited to small groups and everybody must wear a life jacket for safety.

The flooded cave, also referred to as the Blue Pit, is 16 meters deep, 20 meters wide, and 40 meters long giving swimming plenty of room to float around. The pool is a warm 75-degrees Fahrenheit all year.

Originally discovered by diamond prospectors in the 1920s, explorers later found the remains of about 40 species of animals inside the cave. Now the cave is still a hidden gem, rarely drawing tourist crowds.

Visit in the fall for the best lighting. It'll make your instagram friends go nuts.