After one-hour transfer from La Fortuna to the Venado Village, visitors arrive to Venado Caves. Caves were formed during the Miocene period, 15 or 20 million years ago. Limestone rocks, stalactites, stalagmites and corals, form most of the caves. The whimsical stone formations are formed by the underground river. 1 ½ hour guided tour through the caves, using helmets and flashlights. Will walk through a river and waterfalls. Visitor will discover marine fossils, bats, spiders and crickets.