
Castell d'Amposta is a historic fortress located near the Ebre River in Amposta, Catalonia, Spain, now serving as an important archaeological site and cultural attraction. Originally built during the Islamic period, the castle was conquered by Count Ramon Berenguar IV of Barcelona in 1148 and subsequently given to the Order of the Hospital in 1149. The fortress had strategic significance similar to nearby Miravet castle, controlling access to the interior peninsula through the Ebre River valley. Archaeological investigations have revealed the castle's considerable historical importance, though it was heavily damaged during a siege from 1465 to 1466. Today, the town hall maintains the complex—covering approximately 7,000 square meters of Arab and medieval walls—as a public leisure space with cultural facilities and is declared a cultural asset of national interest.