Leap Castle is reputedly one of the most haunted castles in Europe. Originally an O'Carroll family residence, the castle was the scene of many dreadful deeds and is famous for its eerie apparitions – its most renowned inhabitant is the 'smelly ghost', a spirit that apparently leaves a smell behind after sightings.
Renovations are ongoing, but you can arrange a visit. It lies about 12km southeast of Birr between Kinnitty and Roscrea (in Tipperary).