Sitting at the northern shore of Belfast Lough, Blackhead Lighthouse's beams once watched over the likes of the Titanic, Olympic and Britannic as they left Belfast for open water. Today, thanks to the Irish Landmark Trust, you can spend the night at the lightkeeper’s house beside this great beacon. While you’re here, keep your eyes peeled for the secret tunnel used by keepers to access the light from the house during stormy weather. And take your waterfront adventure that bit further with a stroll around The Gobbins, a winding path that wraps its way around County Antrim's cliff face: created over 100 years ago, this is a stunning feat of Edwardian architecture.
If you have more time

Titanic Belfast (16 miles from Blackhead Lighthouse) in the eponymous city is a stunning interactive insight into the myth and realities of the “Ship of Dreams” – take afternoon tea by the Grand Staircase while you're there.