This jail was a significant player in the deadly Easter Uprising in 1916, a dark and significant day in Ireland's history. A tour is the only and best way to see the grounds, and the guides rarely disappoint. Beginning in a small museum, you'll soon learn the 200-year history of the jail, and then tour the dark cellblocks that housed prisoners-seen as both traitors and heroes-who were infamously treated poorly or executed. Even the prison's exercise yard has a unique story all its own. The jail is open year-round, but arrive early in the day to this popular attraction, and bundle up if the day is chilly-the building can be very cold.