The Maldives has an average elevation of 1.5 meters — making it the most at-risk country from sea level rise.

The Colosseum in Rome demonstrates advanced ancient engineering.

Akrotiri was preserved under volcanic ash on Santorini.

The Sahara Desert has both sand dunes and rocky plateaus.

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 shortest commercial flight in the world is between two Scottish islands — it lasts about 90 seconds.

The deepest lake in the world is Lake Baikal in Russia — it reaches a depth of over 5,300 feet.

The tallest mountain above sea level is Mount Everest.

The Great Wall of China stretches over 13,000 miles.