Þingvellir, Gullfoss,Geysir are the route's most famous landmarks, but along the way, you'll discover a 6500-year old crater, take a dip in a hot spring (or two) like the Blue Lagoon and the Secret Lagoon, and walk along awe-inspiring cliffs where thousands of birds migrate to nest each year. You'll discover how the Icelanders lived in the midddle ages and marvel at the dauntong Mount Hekla, which was once believed to be the entrance to hell.