The Inca city of Chan Chan in Peru is the largest pre-Columbian city in South America — covering 20 square km.

The Great Lakes were formed by glacial movement.

Hawaii is moving toward Japan at about 3 inches per year.

The largest island in the world is Greenland.

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

The Eiffel Tower was supposed to be demolished 20 years after its construction in 1889.

The Aswan High Dam controls flooding of the Nile River.

Petra in Jordan was carved into rose-colored rock cliffs.

Iceland sits directly on the Mid-Atlantic Ridge and is actually spreading by 2.5 cm per year as two tectonic plates diverge.