The world's largest employer is the US Department of Defense, followed by China's People's Liberation Army.

The Great Wall of China spans thousands of miles.

Russia is so large it spans 11 time zones.

The Atacama Desert in Chile is the driest non-polar desert on Earth — some weather stations there have never recorded rain.

The United States purchased Florida from Spain in 1819.

Petra in Jordan was carved into rose-colored rock cliffs.

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

The Sahara Desert is roughly the same size as the United States.

The Andes Mountains stretch along South America's western coast.