The site of cult for Catholics is, of course, the Shrine of Guadalupe:
The original one was built over the place where Virgin Mary presented herself to Juan Diego and made the Miracle of the Roses (made him pick some roses which he kept on his garments, and, when he was to show the roses to bishop Zumárraga, the famous image miraculously appeared imprinted on them)... funny thing is that the bishop never wrote about it.
When the original shrine proved insufficient for the cult, a new one was built:
This is how it looks from above:
This is how it looks inside:
And this is how it looks if you're a pilgrim: