Ordesa y Monte Perdido National Park

A deep limestone canyon in the Spanish Pyrenees, with cliffs and waterfalls rising above beech forests, shared with France's Gavarnie as a UNESCO World Heritage Site. The classic walk follows the Arazas river from the Pradera de Ordesa to the Cola de Caballo (horsetail) waterfall, about 17 km return and fairly easy.

In summer and at Easter, private cars are banned and a shuttle bus runs from Torla. Experienced walkers can climb to the Monte Perdido or the Faja de Pelay, a path along the canyon wall.