Santorini is one of the Cyclades islands in the Aegean Sea. It was devastated by a volcanic eruption in the 16th century BC, forever shaping its rugged landscape. The whitewashed, cubiform houses of its 2 principal towns, Fira and Oia, cling to cliffs above an underwater caldera (crater). They overlook the sea, small islands to the west and beaches made up of black, red and white lava pebbles.

Bora Bora is a small South Pacific island northwest of Tahiti in French Polynesia. Surrounded by sand-fringed motus (islets) and a turquoise lagoon protected by a coral reef, it’s known for its scuba diving. It’s also a popular luxury resort destination where some guest bungalows are perched over the water on stilts. At the island’s center rises Mt. Otemanu, a 727m dormant volcano.

Tahiti is the largest island in French Polynesia, the South Pacific archipelago. Shaped like a figure-8, it’s divided into Tahiti Nui (the larger, western section) and Tahiti Iti (the eastern peninsula). With black-sand beaches, lagoons, waterfalls and 2 extinct volcanoes, it’s a popular vacation destination. Explored by Captain James Cook in the 18th century, it was also often painted by French artist Paul Gauguin.

Mallorca (Majorca) is one of Spain’s Balearic Islands in the Mediterranean. It’s known for beach resorts, sheltered coves, limestone mountains and Roman and Moorish remains. Capital Palma has nightlife, the Moorish Almudaina royal palace and 13th-century Santa María Cathedral. Stone-built villages include Pollença, with its art galleries and music festival, and hillside Fornalutx, surrounded by citrus plantations.