This is the northwest corner of El Castillo in Chichén Itzá, Mexico:
El Castillo is a bit of a funny thing — half of it has been restored to nearly what it once looked like (or at least, so it’s thought locally — although some writers are skeptical about the accuracy of its current form). Meanwhile, the other two faces have just been consolidated. So if you want a pretty picture of the structure, the north and west sides are the ones to use.
By the way, I’ve got a bunch of Maya shots languishing over in my Flickr stream — so to get them a bit more visibility, I’ll be getting them in blog posts here over the next week or two. Prepare for an onslaught of ruin(s)!