Isle of Lewis, Scotland
The Isle of Lewis isn't technically an island—it shares its southern border with the Isle of Harris—but it's easy to overlook this fact when you encounter its most mysterious attraction. The Callanish Stones consists of a large circle created from 13 stones that surround a burial chamber in the center, with four stone alignments jutting out to form a cross shape. It is believed the monument was erected shortly after 3,000 B.C., offering a glimpse into mythical ancient Scotland.
(Photo: iStockphoto/Joe Gough)