Fodor's Expert Review Eldvörp

This 10-km-long (6-mile-long) row of craters formed in the Reykjanes Fires, a volcano-tectonic episode in AD 1210–1240. The whole area has a spooky and majestic vibe thanks to the steam escaping the craters as well as a nearby borehole. Eldvörp is a bit hidden, but several well-marked walking trails pass near it, including the Reykjavegur. It's also accessible on foot, by bike, and by car on a dirt track from the Grindavík–Blue Lagoon link road.