Dolmens of Castellterçol Curiosity · Castellterçol, Moianès, Barcelona The dolmens of Castellterçol (Barcelona, Moianès) are part of the region's route of dolmens and castles. Among them is the dolmen del Gavatx, a closed rectangular cist burial located west of the town centre, at 736 metres of altitude, probably built in the Chalcolithic. The box measures 2.20 m long by 1.30 m wide and 1.25 m deep, and is preserved without a cover, whose slabs would be scattered next to the tumulus. Photo: Casesnoves (CC BY-SA 4.0) What to see and do in Castellterçol