Northwest of Madrid near the coastline of Cantabria, the Parque Nacional De Los Picos de Europa is popular for its scenic limestone massifs similar to the Alps.
A good base for exploring Parque Nacional De Los Picos de Europa is the town of Cangas De Onis on the northwest side of the park. Keep in mind that there are very limiting restrictions on camping within the park. The park is very busy in July and August. Although bus service access to the park is limited, there are some good 4WD taxi services.
Overall, Parque Nacional De Los Picos de Europa is the 17th most popular hiking trail of all 21 hikes in Spain.