Marble Arch Caves

From Drumcliff churchyard, return towards Sligo and, at Rathcormack, turn left through the village of Drum to join the N16 as it travels east towards Enniskillen. Cross into Northern Ireland and take the first turn to your right following signposts to Marble Arch Caves. This extensive network of limestone chambers (billed as “over 300 million years of history”) is most impressive. The tour includes an underground boat journey, walks through large illuminated chambers, galleries hung with remarkable stalactites, and a “Moses Walk” along a man-made passage through a lake where your feet are at the bottom of the pool and your head is at the same level as the water. Remember to dress warmly and take a sweater. It is best to telephone in advance because, if there has been a lot of rain, the caves are closed. (Open Mar–Oct, tel: 02866 348855.)