Back when the fourth Indy movie came out, the history channel did a whole lot of shows on real life Indiana Jones'. In one of those programs I remember seeing something about NASA using satellites they had in orbit around the earth to take photographic images around the Yucatan. they used thermal imaging, and located all of the known archaeological sites(all of the pyramids and stuff). then using what they learned from those images they found a lost pyramid in the middle of the jungle. Its wickedly cool stuff. especially for those select few people in the world who enjoy the idea of archeaology, but can't seem to get away from our modern world. "close a door... open a window"