evidence: Make time to visit the Barbican Gate, and admire the ornate Stone Bridges, and the mystical Hermitage. This is one of the best places to visit in Northern Ireland for good reason! [...] 11. Crumlin Road Gaol [...] Attractions include the tunnel from the goal to the courthouse, the holding cells, and the chilling Hangman’s Cell. If you’re wondering what to do in Northern Ireland when it’s raining, this is a great shout.