This video is from a rather interesting Swiss video program showing archeologists making good use of 3D print tech.
They're excavating an ancient Roman amphitheater and surrounding structures, carefully recording locations and dimensions of the buried buildings. Back at the lab, they transform the field survey results into 3D models, which are then printed and positioned to form a complete model of the long-destroyed amphitheater. Bonus use: the 3D models can also be assembled into a large-scale 3D world where visitors can tour through the site as it existed hundreds of years ago.
Via SF.TV (hit the "Amphitheater, gedruckt" link to watch) (Hat tip to Thomas Amberg!)