The Schmalkalden sinkhole

November 1. 2010 a sinkole measuring more than 130 feet wide and 65 feet deep appeared in the middle of the night in a residence area of the German town Schmalkalden. No one was hurt, only a garage was damaged and a car droppen down into the sinkhole.

25 residents in 6 houses had to leave their home.

Experts believe it was because underground water washed away salt, minerals and soil during years.

http://www.n-tv.de/panorama/Krater-hat-natuerliche-Ursache-article1828096.html

http://www.huffingtonpost.com/2010/11/02/schmalkalden-german-sinkhole-swa_n_777800.html