Louisiana is the only state that grows in land area every year (Due to alluvial deposits from the Mississippi River).
41
The Caspian Sea is also classed as the world's largest lake.
52
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
More than 25% of the world's forests are in Siberia.
51
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
Forest fires move faster uphill than downhill.
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There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
Mexico City is built on top of an underground resevoir!
47