Clonony Castle is a late medieval tower house built in 1500 by the MacCoughlan clan, standing approximately 15 metres tall in County Offaly. The fortification features classical tower house elements including machicolation, murder holes, gun-loops, and spiral staircases, surrounded by a bawn wall and formal entrance with smaller towers. Notably, the castle passed to Thomas Boleyn when Henry VIII sought to marry his daughter Anne, and Mary and Elizabeth Boleyn, second cousins to Queen Elizabeth I, lived here. Now a National Monument, the castle is easily accessible from Shannonbridge with roadside parking available.