House of the Commandery of Ulldecona Monument · Ulldecona, Montsià, Tarragona House of the Hospitaller commander of Ulldecona, built in the 15th century as the administrative seat of the commandery created in 1227, with Ramon de Cervera as its first commander; only the Gothic façade survives, since the interior disappeared when it passed into private hands after the commandery was dissolved in 1851. Photo: Josep Salvany i Blanch (Public domain) What to see and do in Ulldecona