Ashtown Castle is a restored tower house structure within Phoenix Park, Dublin, possibly dating from the 15th to 17th century. For decades it remained hidden within a Georgian mansion until that structure's demolition in the late 1980s unexpectedly revealed this medieval gem, which underwent complete restoration. The site features a Victorian Kitchen Garden, the Phoenix Park Visitor Centre with exhibitions tracing the park's history from 3500 BC to the present, woodland walking paths, and a restaurant. Free admission and accessible facilities make it a popular family destination.