Fodor's Expert Review Dimmuborgir

Southwest of Hverfjall is this mesmerizing lava field known as Dimmuborgir, or "Dark Castles," a labyrinth of tall and twisted formations where you can choose between short and longer signposted routes through the eerie yet enchanting landscape. The best views are available in September when the fiery reds and oranges of the dwarf birch trees contrast brilliantly with the jagged black peaks, crags, and crevices within. It's also fun to visit during the holiday season when the Icelandic Yule Lads take up residence in Dimmuborgir's many hiding spots.