Antarctica receives less than 200 mm of precipitation annually — making it technically the world's largest desert.

The Sydney Harbour Bridge is one of the largest steel arch bridges.

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

Norway has a town called Å.

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

The Colosseum in Rome could hold up to 80,000 spectators — comparable to a modern NFL stadium.

Ancient volcanic eruptions shaped prehistoric environments.

The Gobi Desert is the fastest-expanding desert in the world and covers parts of northern China and southern Mongolia.

The Eiffel Tower was once the tallest man-made structure on Earth.