These holes are not only amazing, but some are really terrifying; the sheer scale of these holes reminds you of just how tiny you are.

1. Kimberlee Big Hole -- South Africa

Apparently the largest ever hand-dug excavation in the world, this 1097 meter deep mine yielded over 3 tons of diamonds before being closed.

2. Glory Hole -- Monticello Dam, California

A glory hole is used when a dam is at full capacity and water needs to be drained from the reservoir. This is the 'Glory Hole' at Monticello dam, and it's the largest in the world of this type of spillway, its size enabling it to consume 14,400 cubic feet of water every second.

3. Great Blue Hole -- Belize

This incredible geographical phenomenon, known as a blue hole, is situated 60 miles off the mainland of Belize. There are numerous blue holes around the world, but none as stunning as this one.

4. Sinkhole -- Guatemala

These photos are of a sinkhole that occurred early this year in Guatemala. The hole swallowed 2 dozen homes and killed at least 3 people.

5. And the really terrifying one!

This is the 'Biggest Sink Hole of All' that you have heard about. It is capable of swallowing trillions and trillions of U.S. dollars ... Annually!