Cholula
The church of Nuestra Senora de los Remedios atop the Great Pyramid of Cholula. Photo via Wikimedia Commons.
A town built over the Great Pyramid of Cholula, the largest pyramid by volume in the world, crowned by the yellow Nuestra Señora de los Remedios church. Tunnels run through the pyramid's core, and the site museum explains its layers. On a clear day, the Popocatépetl volcano rises behind the church towers.