A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
Israel's Dead Sea is 1,312 feet below sea level.
48
Forest fires move faster uphill than downhill.
52
There are more than 50,000 earthquakes throughout the world every year!
47
The city of Houston, Texas is built on a swamp and is slowly sinking!
89