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 Caspian Sea is also classed as the world's largest lake.
52
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
Even Antarctica has an area code. It's 672.
58
Every year, Alaska has about 5,000 earthquakes.
31