Crookston Castle is in the care of Historic Scotland but has free entry. You get two castles for the price of one. It has the ditch and earthen rampart of a 12th century ringwork castle and in the centre the ruinous remains of a 15th century stone castle of unusual form. It's on a hilltop and there's a good view of the southwest side of the city from the top of the tower.
Off Brockburn Road, Pollok, SW of Glasgow city centre. Exit M8 at Junction 26
www.historic-scotland.gov.uk/properties_sites_detail.htm?propertyID=PL_077
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