Ancient Civilizations
Ancient Rome
An empire that fell over 1,500 years ago and still runs your local plumbing, legal system, and calendar.
The Maya
A civilization that invented the concept of zero independently, then built some of the tallest structures in the Americas without metal tools or the wheel.
Ancient Egypt
A civilization so stable that it lasted longer than the time separating us from Cleopatra separates her from the building of the pyramids.