Ice cave in the Skaftafell National Park in Iceland. Ice caves collapse and new ones form as each glacier grinds slowly towards the sea. Local guides can help you (without dying) find one. (Visit Skaftafell National Park in Iceland.
Meteora, Greece, is an area in Thessaly (Central Greece) and Kalampaka is the city under the rock towers of Meteora. The thing that makes Meteora so special is the monasteries on the top of the rock towers.