Tower of Can Roca de Baix Monument · Castelldefels, Baix Llobregat, Barcelona The Torre de Can Roca de Baix, heavily restored, preserves the corner ashlars of reddish stone and a defensive machicolation typical of its original watchtower function. Around it a farmhouse was built up over time, whose oldest section retains doors and windows with sills, jambs and lintels carved from a single piece of red sandstone; the more recent addition is covered by a single sloped roof. Photo: Segoviapaula (CC BY-SA 3.0 es) What to see and do in Castelldefels