Castillo de Langa is one of the most significant refuge castles in Aragón, with 14th-century ruins crowning a hilltop in Langa del Castillo, Zaragoza. Documented in 1131 as part of Calatayud's jurisdiction, the castle was substantially enlarged by order of Peter IV in 1357 to counter Castilian threats, serving both as a fortress and refuge for area inhabitants. The structure once occupied approximately 5,000 square meters and featured a Tower of Homage, defensive walls, and entrance gate, guarding the passage of the Jalón river through the Perejiles valley. The site is threatened by natural collapses due to ancient galleries honeycombing the rock beneath, but remains an important example of medieval military architecture and community defense strategy in the Comarca of Daroca.
