Theres a lot of enigma surrounding the Mayans - their script, complex calendars, mythological legends and immense astrological and mathematical knowledge are all reasons enough to arouse interest. Perhaps theres even more to uncover in their cave systems Caves Branch Adventure Company allows one to spend a day exploring a Mayan cave in Belize, Central America. The excursion begins with a 40 min hike through a jungle, followed by an exploration of the actual cave chambers, which contain millennia-old fire pits, earthen pots, bowls, relics, glyph writings and even skeletons of people once sacrificed, yikes! Starts $85 per person, taxes extra includes lunch, helmet, headlights and water. More details here