1 Best Sight in Catalonia, Valencia, and the Costa Blanca, Spain

Cueva de las Calaveras

About 15 km (9 miles) inland from Dénia, this 400-yard-long cave was named for the 12 Moorish skulls found here when it was discovered in 1768. The cave of stalactites and stalagmites has a dome rising to more than 60 feet and leads to an underground lake.