I believe I read about the dungeon in Venice at Palazzo Ducale? I'm curious if anyone here has ever checked it out? I suppose what I am trying to say is do you think waiting in line for the "tour" is worth it?
Find out when it closes and show up about 2 hours before that. Far fewer crowds. I've been through the dungeon part of the tour and I found it very interesting (in a "how could one human do that to another?" kind of way). You don't need to do an actual tour, just get in line and go through it yourself, although a tour would probably make it more interesting.