Book your tickets for El Soplao Cave and explore a geological wonder comprised of over 20km of tunnels and galleries, discovered in Cantabria in 1908. The cave owes its name to “los soplaos,” the term miners used to refer to the karst cavities they cut through during their work, which created strong air currents. The tour lasts approximately one hour, and in addition to the rock formations you’ll see inside El Soplao Cave, you’ll enjoy one of the best views of the Picos de Europa mountains.