[jcranmer]

It's not that much of an exaggeration. Tenochtitlan--the capital of the Aztec Empire--is estimated to have been about 120-150k people at the time of contact, which is larger than any city in the Spanish Empire at the time. Even the Spaniards themselves, as they recorded in their journals, were astonished at the scale of Tenochtitlan.

[VHRanger]

And it was such an amazing civil engineering project on top! Built in a lake with aqueducts, land bridges, etc.

It must have been truly something to behold even by today's standards.