The National Museum of Scotland has just published a paper detailing how they used CT scans to image a 300-year-old pocket-watch found in a 17th century shipwreck. My favorite scan is above. Nature News reports:
The watch looks little more than a lump of rock from the outside, but the scans show that the mechanism inside is beautifully preserved, from delicate cogwheels and Egyptian-style pillars to the maker's inscription.
The rest of the story is equally interesting. A slideshow is also available via Nature, as is a video flythrough (.mov).
Scan by Trustees of NMS