As the son of a Hungarian who escaped during the 1956 uprising, I have visited Budapest several times over the last 20 years.
The most amazing sight is the former Ministry of Defense Building. It is pock-marked with bullet holes and tank fire. Yet the Hungarians have kept this building intact and have denied any efforts to restore it.
They want to keep the building as a reminder of what Communism does to a free people and that they will never, ever allow this to happen again.
There's a museum now in Budapest called "The Terror Museum" based on Hungarian treatment by the Nazis and the reds. I think it's in that same building.