This is a diamond mine in Siberia
Just off the coast of Belize, by far the most beautiful hole.
This hole in Canada, has it's own runway, to give an idea of the size, there's a 737 parked there.
This hole in a dam in California, is used to drain off excess water. Interesting.
A naturally occuring hole in Guatemala, that swallowed 3 homes, woops!
Utah, a hole started in 1863, now 4kms wide, probably as deep. Don't look down!