Ojo Guarena·Spain
Photo: Wikimedia Commons · Wikimedia Commons
Ojo Guarena is a hundred-kilometre karst maze under northern Burgos - the classic Palomera through-trip follows an underground river, while a rock hermitage marks the show-cave mouth for everyone else.
In season: Year-round · Peak: Year-round
Committing through-trips with water, crawls and route-finding for equipped cavers; the San Bernabe show cave is an easy visit. Constant cool temperature year-round.
The accessible section with the painted hermitage
The classic river passage in one of Europe's largest karst systems
Fossil passage away from the water, a long crawling trip
Go with a local caving club or guide for the Palomera and Dolencias trips - they are not for the unequipped. The San Bernabe hermitage cave is open to visitors near Villamartin.
CavingFrance
The Vercors shaft that was the first cave taken past −1,000 m — a committing vertical descent.
CavingIceland
Þríhnúkagígur — lowered 120 m into a magma chamber; Raufarhólshellir as the easy option.
CavingSlovenia
Škocjan: a vast underground river canyon in the Slovenian karst that gave the landform its name.
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