The second level Archaeology skill "It Belongs In A Museum" reads:
Send an artifact to the giant, secret scary government room full of boxes, and gain experience equal to its value.
but I can't seem to do anything with it. I've tried using the spell on anything that would seem to be an artifact and most things that wouldn't: monuments with flavor text, any items I've found, monsters, etc. but nothing happens.
So what constitutes an artifact?