© Cat Biggar
Long considered to be the most romantic Greek isle—which explains its appeal for honeymooners—Santorini also has a unique natural environment. The crescent-shaped island is the world’s largest caldera (the result of volcanic explosion in 1500 b.c.). There is a still-active volcano, thriving villages (Fira and Oia), as well as pristine black-sand beaches and views from every corner. The highlight of each day is sunset: Picture a gold medallion dipping beneath the placid water.