Ross Castle was built by O’Donoghue Mór in the 15th century and is located on Killarney’s lower lake Lough Leane. It is part of Killarney National Park and was originally part of Earls of Kenmare estate. A legend exists that O’Donoghue still exists in a deep slumber under the waters of Lough Leane. There are tours held every day during the summer and there are numerous walks that can be taken around the castle. Boat tours also take place from the dock next to Ross Castle.