The entrance to this long cavern is situated in pine woods 9km southeast of San Cristóbal, a five-minute walk south of the Pan-American Hwy. The first 350m or so of the cave is lit and open for viewing, with a concrete walkway threading through a dazzling chasm of stalagmites and stalactites. An extensive army base buffers the caves, but visitors are still welcome. Horseback riding is available from the parking area, where you’ll also find comedores.