The Three Gorges Dam spans the Yangtze River.

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

Greenland is the world's largest island.

The Colosseum in Rome could hold between 50,000 and 80,000 spectators and had a retractable awning called the velarium.

New Zealand was the first country to give women the right to vote, in 1893.

The Earth's crust is thinner beneath oceans.

The longest cave system in the world is Mammoth Cave in Kentucky.

Antarctica is technically a desert because it receives very little precipitation.

Norway has a town called Å.