Fodor's Expert Review Hverir

Next to the Námaskarð Mountain Ridge, on the eastern side of the Ring Road, are the bubbling, gray-mud sulfur springs of Hverir, boiling like a witch's cauldron in the strange red-and-yellow valleys. Hike around this fascinating area, but remember to step carefully. Though the sulfurous vapors smell like rotten eggs, the fumes are generally harmless.