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

The Colosseum in Rome was completed in the first century.

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

Mount Everest is not the closest point to space — due to Earth's equatorial bulge, Mount Chimborazo in Ecuador is actually closest to the stars.

The ancient city of Byblos is one of the oldest continuously inhabited places.

The tallest mountain above sea level is Mount Everest.

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

The Sahara Desert receives less rainfall than most regions.

Iceland is home to more than 100 volcanoes and experiences an earthquake almost every day.