I liked this and appreciated the images, but although thought it was kind of funny that they mentioned "For one, the city was very very clean, no litter or waste polluted the streets," but not the relatively huge number of child skeletons on altars, neatly stacked formations of baby skulls and that sort of thing found in alarming quantities in these temples. 

I wondered if the baby killing for whatever terrible "Gods" these folks had or imagined they had was also in the older Teotihuacan culture mentioned in the imgur post, and... sadly, yes https://en.wikipedia.org/wiki/Child_sacrifice_in_pre-Columbian_cultures#Teotihuacan_culture

#righteousvolcano

That is sad, because otherwise the structures seem quite majestic.

Pyramid of the Sun, Teotihuacan

This is the Pyramid of the Sun in Teotihuacan, located outside of Mexico City. It is NOT Aztec and it is NOT Maya. Far too common misconceptions. This is a Teotihuacano temple part of the Teotihuacan civilization that existed 625 years BEFORE the Aztec civilization even existed. This civilization shared no co existence with the Aztec, however it did share coexistence with the Maya who lived roughly 500 miles to the south of this city. The Teotihuacan civilization actually influenced the Maya civilization. In fact in the year 378 A.D. Teotihuacan conquered the Maya city of Tikal, in present day Guatemala and spread their influence in the Maya world. In the year 700 A.D. Teotihuacan was abandoned, its residents and royalty fled. Recent findings suggest that a massive volcanic eruption south of the city was responsible for this, as crops failed due to high levels of ash rendering the high population, estimated to be around 125,000, of the city unsustainable. Later, when the Aztecs came upon it for the first time, it is said they believed the gods had built the city and left it alone as a sacred place.