Castell d'Agost crowns the highest hill in the municipality of Agost in Alicante province, where only medieval ruins now remain. The fortress likely dates to the Islamic period when control of such elevated positions was crucial for regional defense and communication networks. A small chapel stands beside the castle, with its walls partially constructed using the castle's own stone, illustrating the site's enduring spiritual significance through successive historical periods. Although detailed medieval records are limited, the castle's commanding position above the town underscores its former strategic and administrative importance within the region's fortification network.
