The Caspian Sea is the world's largest inland body of water and is classified as a lake despite its salt water.

The Sahara Desert receives very little annual rainfall.

Greenland is the world's largest island.

The United States Senate and House of Representatives form Congress.

Urban populations now exceed rural populations worldwide.

Mount Everest is not the closest point to space — that distinction belongs to Mount Chimborazo in Ecuador, due to Earth's equatorial bulge.

The city of Venice is built on 118 small islands connected by 400 bridges.

The Great Wall of China is not visible from space with the naked eye — it's too narrow relative to its length.

The Arctic experiences months of continuous daylight in summer.