The Loltún ("stone flower" in Mayan) is one of the largest and most fascinating cave systems on the Yucatán Peninsula. Long ago, Mayan ceremonies were routinely held inside these mysterious caves, and artifacts found inside date as far back as 800 BC. The topography of the caves themselves is fascinating: there are stalactites, stalagmites, and limestone formations known by such names as Ear of Corn and Cathedral. Illuminated pathways meander a little over a kilometer
through the caverns, most of which are quite spacious and well ventilated (claustrophobics needn't worry). Nine different openings allow air and some (but not much) light to filter in. Moisture can make these paths somewhat slippery so be sure to wear shoes that grip. You can enter only with a guide. Although these guides earn a very small salary, they mostly survive on tips—so be generous. Scheduled tours are at 9:30, 12:30, 3, and 4 (in Spanish), and 11 and 2 (in English).