This one-time Cistercian Monasterio de Piedra, 28km southwest of Calatayud, dates from the 13th century but was abandoned in the 1830s. Subsequent owners laid out the ground as a formal wooded park full of caves and waterfalls, the latter fed by Río Piedra. It's a wonderful place for a family day out, although it can get overrun on summer weekends. Incorporated into the complex is the Hotel Monasterio de Piedra.
On Tuesday, Thursday, Saturday and Sunday, Automóviles Zaragoza runs a 9am bus from Zaragoza to the monastery (€14, 2½ hours) via Calatayud, returning at 5pm.
