An archaeological marvel, a UNESCO World Heritage site, and one of the world’s most enigmatic tourist attractions, Stonehenge draws up to 1.3 million visitors annually. The site itself—a circle of gigantic stones standing in the heart of the English countryside—is made even more impressive by its mysterious history. Although Stonehenge’s original purpose remains unknown, onlookers gather to admire the 3,500-year-old structure and ponder its astronomical, spiritual, or even supernatural meaning.