Highlands, Iceland
The isolated highlands of Iceland have some of the most superb natural sights in the Northern Hemisphere. The mindblowing glaciers, craters, lakes and geysers are breathtaking by day, but when night falls, the area becomes one of the best places to witness the aurora borealis.
Sadly, the mining company that owns the caves could no longer afford to keep the massive pumps going to clear the chamber. I believe the pumps were shut down a few years ago and the cavern is refilled with water. The crystals are growing once again, but no one will ever see it.