"The site itself is shrouded in magic and mystery.
One of the most important facts, which many people are unaware of is that the great pyramid of Cholula is larger than the Great Pyramid of Giza."
I have been to this pyramid at Cholula. There definitely is a magical and mysterious feeling when there. There is a part where you can walk through it, especially feel something different there.
I liked the history explained there where the two cultures lives, ancient with modern at Cholula.
from Wikipedia:The pyramid is a temple that traditionally has been viewed as having been dedicated to the god Quetzalcoatl.
Someone told me story of when he visited there he literally saw a serpent with wings. When he ran to get a better look it ran away quickly as soon as he moved. So he will never really know what exactly it was.