The Colosseum could be flooded to stage naval battles — a system of underground channels enabled this.

The Earth's crust is thinner beneath oceans.

Fact #127 · Geography

There are caves on Earth so deep they have their own weather systems.

Fact #2234 · Geography

The Atacama Desert in Chile is so dry that some weather stations there have never recorded rain.

Fact #4265 · Geography

The Ice Age shaped many of today’s landscapes.

Fact #713 · Geography

The Earth is about 4.5 billion years old.

Fact #172 · Geography

Mongolia is the world's least densely populated country, with about 5 people per square mile.

Fact #3753 · Geography

Antarctica is technically a desert — it receives less precipitation than the Sahara.

Fact #3593 · Geography

Russia is so large it spans 11 time zones.

Fact #3391 · Geography