From the Thanatos Death Mask Gallery:
"A death mask is a wax or plaster cast of a mold taken from the face of a deceased person. Death masks are true portraits, although changes are occasionally made in the eyes of the mask to make it appear as though the subject were alive. For the last few centuries they have been kept as mementos of the dead, much like postmortem photography."
The index doesn't include names, but if you click on a picture it tells you who it is. I think it's especially neat to see folks like Benjamin Franklin, who we don't have any photographs of. There's also this one:
puported to be of a certain William Shakespeare. I've articles that say, yes, it's definitely the Bard; and I've read articles that say, no, it's certainly not. But either way, it's a death mask of someone, and it's been around for a few centuries.
A quick visit to the bottom of this comment page from Making Light's will give you names and links directly to all of the death masks at Thanatos.