Perched atop a rocky outcrop, guarding passage over the Alhama River, stand the remains of a keep and a building with a vaulted roof. It was here that the Treaty of Tudilén was signed between the Kingdom of Castile and the Kingdom of Aragon in 1151.
It is located southeast of the Baths, on the right bank of the Alhama River. Remnants of its keep and some dwellings are still preserved. Its earliest records date from the 12th century, although it is believed to have been built during the period of Moorish occupation.