Archeologists in Belize used airborne laser signals that penetrate the jungle cover and are reflected from the ground below. They yielded 3-D images of the site of ancient Caracol, one of the great cities of the Maya lowlands.
In only four days, a twin-engine aircraft equipped with an advanced version of lidar (light detection and ranging) flew back and forth over the jungle and collected data surpassing the results of two and a half decades of on-the-ground mapping.
Full story from New York Times
Caracol archeological project at University of Central Florida