Aínsa, Spain sits where the medieval hill town gives way to the Sobrarbe ranges and the long ramparts of the Pyrenees. Walk out toward Arcusa on PR HU 70 for quiet villages and open ridgelines, or take the tougher line to the Hermitage of Espelunga on PR HU 43, where rocky slopes and big valley views define the day. This is a strong base for hikers who want mountain character without losing touch with old stone streets.