The Trans-Siberian Railway passes through 8 time zones — completing the journey takes 7 days.

The Nile flows northward — it is one of the few major rivers in the world that flows from south to north.

There are more than 17,000 islands in Indonesia — making it the world's largest archipelago country.

Lake Baikal is the deepest freshwater lake in the world.

The Earth's continents were once joined in a supercontinent called Pangaea.

The Sahara Desert is expanding southward at a rate of about 48 kilometers per year due to desertification.

Nan Madol is an ancient city built on artificial islets in Micronesia.

In Switzerland, it is illegal to own just one guinea pig — they are social animals and must have a companion.

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