Peñón d'Ifach Natural Park
The landscape of Calpe is dominated by this huge calcareous rock more than 1,100 yards long, 1,090 feet high, and joined to the mainland by a narrow isthmus. The area is rich in flora and fauna, with more than 300 species of plants and 80 species of land and marine birds. A visit to the top is not for the fainthearted; wear shoes with traction for the hike, which includes a trip through a tunnel to the summit. The views are spectacular, reaching to the island of Ibiza on a clear day. Online reservations are essential as daily capacity is limited to 300 visitors. Website is in Spanish, but there's a how-to-reserve guide in English