Castle of Gaià Monument · Gaià, Bages, Barcelona A 10th-century castle documented since 936, of which only wall vestiges survive along with the foundations of five great defensive stretches; on its site the chapel of Santa Àgueda was built, restored and opened in 1986. Excavations in 2002 recovered around a hundred ceramic fragments from Iberian, Roman and medieval occupation. Photo: Araceli Merino (CC BY-SA 3.0) What to see and do in Gaià