Geysir and Strokkur are two of Iceland's most amazing springs. Both can send a shooting stream of water at least 100 feet into the air! Geysir is the original hot spring - all the others around the world are named after it. Unfortunately, Geysir hasn't been very active since the 1960s. Stokkur, on the other hand, still erupts about every 10 minutes. (A.J. WHITNEY—GETTY IMAGES)