5. Eyjafjallajökull, Iceland
This unpronounceable volcano in Iceland is covered with an ice cap, and its name means “Island Mountain Glacier”. The last time it erupted in April/May 2010 it caused severe disruption to air travel across Europe. Over 100,000 travelers were affected by flight delays due to the dust cloud. Volcanologists continue to monitor this one closely, but Icelandic tourism continues to boom.
