An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
1
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
Mexico City is built on top of an underground resevoir!
47
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62