Fodor's Expert Review Caldeira

Located toward the center of the island (and therefore best accessed by car), this stunning ancient volcanic crater with a diameter of 2 km (more than 1 mile) and a depth of 1,312 feet started forming at least 400,000 years ago, with the last volcanic event taking place 1,000 years ago. There’s a scenic viewpoint to snap a few pictures, or opt for the fairly easy hike around the 7-km (4-mile) circular trail that winds around the rim’s perimeter; there are some narrow sections, so bring your hiking shoes. The perimeter walk takes two to three hours to complete and offers lovely views of the lush laurel forest and, if you’re lucky and the day is clear, to Mt. Pico in the distance.