There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The Sahara desert expands at about 1km per month.
90
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
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