The tiny island of Santorini, resting in the Aegean Sea, is the site of one of the biggest volcanic eruptions the earth has ever seen. See remnants of volcanic activity in the giant cliffs of the caldera, a geological wonder. The ancient Minoan city of Akrotiri is a major attraction, as are the famous beaches, including Red Beach. Ride a donkey or take a cable car up to the steep cliff walls from the small port of Ormos to the island's capital, Fira.