Santorini was shaped by one of the largest volcanic eruptions in human history. Around 1600 B.C., the center of the island collapsed into the sea, leaving behind the dramatic crescent-shaped cliffs and flooded caldera you see today. Some even link it to the legend of Atlantis. Now, whitewashed villages with blue-domed churches cling to the cliff edges high above the deep-blue water, creating one of the most famous views in the world.

Most visitors stay on Thira, the main island, home to the towns of Fira and Oia, famous for its sunsets. Spend time on Santorini's unusual beaches, with black and red volcanic sand, explore the remarkably preserved Bronze Age city of Akrotiri, often called the Minoan Pompeii, and hike up to the ruins of Ancient Thera. Take a boat into the caldera to walk on the volcanic island of Nea Kameni and swim in the hot springs near Palea Kameni, and visit the quiet island of Thirassia. Taste local wines made from vines grown in volcanic soil.

Santorini is very popular, especially in summer, so plan at least a few days and book early. It's reachable by air and ferry and is a top Greek island cruise stop. I'll find a caldera-view hotel and connect Santorini with other islands.