Cholula Street Work Archaeology
So there we were walking down the street in Cholula after visiting the 2000-year-old pyramid. They're completely redoing all their streets so everything is completely torn up. But we noticed a different kind of pit in the middle of the street, with a woman working in it, which seemed strange. It turns out that all this street work is supervised by archaeologists, and they had discovered a whole house and a burial site underneath it. They invited us to come down into the pit and see their find - a grave with ceramic offerings from about 500 A.D., the "Classic" period of Mesoamerican cultures. So we got educated about real-life archeology right in the middle of the torn-up streets of Cholula!
(Cholula was founded about 620 B.C. and was a major center from about 100 A.D. clear up until the Conquest in the 16th century.)