"We have several hypotheses but no conclusion for the moment."
Scientists hope to learn more about the structures' internal architecture -- and to uncover hidden chambers and other secrets.
Looking for a place a little, er, unconventional to tie the knot? How about on top of a 2,000-year-old Maya pyramid? Or maybe in a church named after 11,000 virgins? Or on a beach where old-time movie stars used to whoop it up? If ideas like these ring a bell, consider these 10 spots south of the border.
Miley Cyrus, take notes. And then burn them. On Monday, Jimmy Fallon challenged "Dumb and Dumber To" star Jeff Daniels to