The Dust Bowl of the 1930s turned 400,000 square km of US farmland into desert through drought and poor farming practices.

The Sahara Desert receives less rainfall than most regions.

The world's deepest lake is Lake Baikal in Russia, containing 20% of the world's unfrozen fresh water.

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

The Great Wall of China is not visible from space with the naked eye — this is a common myth.

The Ganges Delta is the world's largest river delta, covering over 100,000 square kilometers.

The Nile is generally considered the world's longest river, but some measurements put the Amazon ahead depending on source point.

Zhangye once stood along the Silk Road as a trade hub.

New Zealand was one of the last large landmasses to be settled by humans, around 1250–1300 AD.