A vast 2-million-year-old cave, Aillwee is the biggest and most impressive chamber in the region accessible to those who aren't spelunkers. Illuminated for about 3,300 feet, the cave contains an underground river and waterfall. Aboveground, there are a big crafts shop, cheese-making demonstrations, a café, and the Burren Birds of Prey Centre, which puts on flying displays from eagles, falcons, hawks, and owls daily at noon and 3 pm (weather permitting). Discounts available if you book online.
5 km (3 miles) south of Ballyvaughan on R480, Ballyvaughan, Co. Clare, Ireland