County Cork, IE
This is a 17th century star shaped fort, which is very well preserved and has seen very little military action. 45 minute tours depart every hour, last entry 45 min before closing, €3.70, covered by Heritage Card, open mid Mar-Oct daily 10:00-18:00, rest of year 10:00-17:00.
Listen to the audio guide for Charles Fort Lighthouse Free on WIP — starts by itself when you arrive, even with the screen off