"Down in the Marble Arch Caves Glide into these caves by boat, to see the impressive stalactites and stalagmites that have formed in the limestone rock deep underground over millions of years ago. On a guided tour, you'll hear all about the subterranean caverns, stone pools and streams (there are lots of steps so some fitness is required). The whole area is a UNESCO site. Photo: NITB"
The Best of Northern Ireland
