Here is a Flickr album of a bunch of them.
I thought this picture particularly striking. It is someone typing up a list of the order that bodies will be picked up after a massacre by the Shining Path that occurred on Dec 3, 1989 in the town of Orurillo.
The museum itself is a big modern concrete mass (too bad since there are some really nice buildings in Lima) but the inside has some interesting views. Here is one.