Blackrock Castle Observatory is Ireland's unique national astronomy centre. A professional astronomical observatory with a public exhibition - it's a castle as well! So you can visit award-winning exhibitions for all ages that explain the wonders of deep space, take part in games and events in Ireland's first interactive theatre (prepare to save the world!) and when you've done enough stargazing you can return to earth with a tour of the castle and dungeons. The brilliant Blackrock experience began life at Mahon Castle, a 16th century defence against pirates. Now it hosts a world-class scientific resource and a 21st century defence against alien invasion!