A few miles north of Mexico City in Teotihuacan, an ancient civilization built several pyramids and other structures. This culture thrived between 100 BC – 550 AD. In it’s prime, this area supported an estimated 150,000 people. The largest pyramid is known as the Pyramid of the Sun, the third largest pyramid in the world.

Below is a view down what is called the Avenue of the Dead from the Pyramid of the Moon. This was seemingly a massive settlement at one time. The Pyramid of the Sun is on the left:

Interestingly, much of the area, especially underground, remains un-excavated, i.e., unexplored, with the likelihood of more artifacts to be discovered in the future.