The Tower of Santa Maria d'Oló Monument · Santa Maria d'Oló, Moianès, Barcelona Image of Santa Maria d'Oló, not of the place itself. The Torre de Santa Maria d'Oló is what remains of Oló castle, documented since the year 889 and located at the top of the old core of the village, in the Moianès, at an altitude of about 538 metres. It was built between the 11th and 18th centuries; the tower retains Romanesque features, with the lower window as its oldest element, and shows ashlar blocks laid in regular courses and a section in opus spicatum. It belonged first to the Oló family, descended from the viscounts of Girona, and later passed to the house of Montcada (1333) and to the monastery of Santa Maria de l'Estany (1364), before reverting to the Crown in 1606. Of the fortification only a circular tower survives, today integrated into a house, 2.25 metres wide and about 8 metres high. Photo: Paputx (CC BY-SA 4.0) What to see and do in Santa Maria d'Oló