A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
The Sahara desert expands at about 1km per month.
90
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
The Atlantic Ocean is saltier than the Pacific Ocean.
54
There are more than 50,000 earthquakes throughout the world every year!
47