A climber is lowered from a the edge of a huge cave in the Mascun Gorge, near Rodellar, Sierra de Guara mountains, northern Spain, Europe

A climber tackles a severely overhanging route in the caves of the Mascun Gorge, Sierra de Guara mountains, Aragon, Spain

Woman hiking in the Mascun Gorge, one of Europe's most popular canyoning destinations, Sierra de Guara mountains, Aragon, Spain

A climber tackles an overhanging climb in the Mascun canyon, Rodellar, Aragon, Spain, Europe

Woman hiking in the Mascun Gorge, one of Europe's most popular canyoning destinations, Sierra de Guara mountains, Aragon, Spain

A woman on a technical face climb on the limestone cliffs of the Mascun Canyon, Rodellar, Sierra de Guara, Aragon, southern Pyrenees, Spain, Europe

A man on a very long and overhanging climb on the famous limestone cliffs of the Mascun Canyon, Rodellar, Sierra de Guara, Aragon, southern Pyrenees, Spain, Europe

A woman on an overhanging traverse climb on the famous limestone cliffs of the Mascun Canyon, Rodellar, Sierra de Guara, Aragon, southern Pyrenees, Spain, Europe

A rock climber in action on cliffs at Rodellar, Huesca Province, Aragon, Spain, Europe

A climber on a route along the arch of El Delphin (The Dolphin) in the Mascun Gorge, Sierra de Guara mountains, Aragon, Spain

A man on a long and technically demanding face climb on the limestone cliffs of the Mascun Canyon, Rodellar, Sierra de Guara, Aragon, southern Pyrenees, Spain, Europe