4. Trim Castle (Meath County)

Image via Wikimedia Commons, Andrew Parnell 

Trim Castle is the largest Anglo-Norman castle in Ireland, is most well-known for serving as the set of Braveheart. Built beginning in the 1170s, the site underwent excavations and restorations in the 1990s. Amazingly, at some point in its history, the owners rented out part of the fields as the town municipal dump.