The Caspian Sea is also classed as the world's largest lake.
52
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
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
Forest fires move faster uphill than downhill.
52
The Sahara desert expands at about 1km per month.
90
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62