Atop a hill overlooking Lough Arrow, this ancient passage tomb cemetery is impressive, isolated, and frequently empty. Its 14 cairns, dolmens, and stone circles date from the Stone Age (ca. 5000 b.c.), and it’s easy to feel a mystical connection to that history, standing among the cold, ageless rocks. The tombs face Carrowmore in the far distance below and are aligned with the summer solstice. The walk uphill from the parking lot takes about 20 minutes, so be ready to get a little exercise. It’s worth the effort. This is a simple site—no visitor center, no tea shop, no admission fee—nothing but ancient mystery.