Ruta del Cares, Picos de Europa

One of the most spectacular walks in Spain: a path cut into the cliffs of the Cares gorge, deep in the Picos de Europa National Park, with the river far below and limestone walls rising more than 1,000 m above. It follows an old water channel through tunnels and over bridges for 12 km between Poncebos (Asturias) and Caín (León).

The path is mostly level after the first climb from Poncebos, but it has sheer drops without railings. It takes 3 to 4 hours each way; most people walk in from one end and back, or arrange a taxi round to the other end (a long drive). Go early in summer to avoid the heat and the crowds. Bring water and a picnic.

The best times to visit the Picos are mid-March to June and mid-September to October; midsummer can be hot and busy. You really need a car in the Picos, as buses are infrequent.