Though most of the castle now houses a restaurant and event venue, several key attractions on the estate keep visitors coming to this striking structure. Find the Cave Hill Visitor Centre in the basement, which tracks the human history of the hill, as well as the castle’s development. The spectacular grounds are an excellent place for a stroll, with the 1,200-foot (366-meter) tall McArt's Fort lookout providing sweeping views over Northern Ireland’s capital. A stop at the castle is included on most Belfast city sightseeing tours and hop-on, hop-off bus tours.