Castell Monestir d'Escornalbou is a distinctive early twentieth-century seignorial mansion in Riudecanyes integrating two significant medieval structures: the Monastery of Sant Miquel founded in 1153 and a castle built atop Roman fortress remains. King Alfonso el Castro donated an Andalusian castle here in 1170 to Canon Joan de Sant Boi for restoration and fortification, with a mandate to repopulate surrounding territories, establish a church dedicated to Saint Michael, and found an Augustinian community. The complex formed the historic Barony of Escornalbou for over six centuries before deteriorating into ruins following the Desamortización of 1835. In 1911, diplomat, Egyptologist and philanthropist Eduard Toda acquired the ruins and transformed them into an elegant residence, gathering valuable collections of engravings, ceramics, and an extensive library while preserving the site's architectural significance. Accessible via a 3.5-kilometer road from Riudecanyes, it remains a fascinating blend of medieval ecclesiastical and military heritage adapted for modern use.