Rafael jostled me, breaking my train of thought. As we approached the Cuitlahuac traffic circle the cab driver pointed something out that he called a tlachtli . Rafael craned his neck to see it. The building looked like some sort of stadium, a narrow rectangular structure topped with seats on either side and plenty of ornamental stonework. Right next to it was a teocalli —one of the many temples of the multideity Aztlan state religion.