For those people who do not mind getting wet and muddy, this fascinating underground adventure is only 45 minutes from La Fortuna. This subterranean tour will take you through narrow passages, incredible labyrinths and chambers where you will see the famous rock formation named La Papaya, and other stalactites and stalagmites that will surely astonish everybody. Here you will see many spiders and bats which frequent this place. The amazing Venado caves were formed during the Miocene period, 15 or 20 million years ago. For many years they remained below sea level but due to tectonic plate movements they surfaced.