Rising about 75m (250 ft.) from the sea, St. Michael's Mount is topped by a part medieval, part 17th-century castle. It's 5km (3 miles) east of Penzance and is reached at low tide by a causeway. At high tide, the mount becomes an island, reached only by motor launch from Marazion. In winter, you can go over only when the causeway is dry.

A Benedictine monastery, the gift of Edward the Confessor, stood on this spot in the 11th century. The castle now has a collection of armor and antique furniture. A tea garden is on the island, as well as a National Trust restaurant, both open in summer. The steps up to the castle are steep and rough, so wear sturdy shoes. To avoid disappointment, call the number listed below to check on the tides, especially during winter. Allow 3 hours for a visit.