Got to ride in the B-17 "Aluminum Overcast" for my birthday 4 years ago. What a thrill! The sound is awesome and when you look out the sides from the nose you can see all the props churning. And looking out the little side window from the flight engineer's seat (just behind the co-pilot) your head is about a foot from the prop arc. The catwalk across the bomb bay is about 6 inches wide and I can just imagine crossing it with the bomb bay open over Nazi Germany in January at 30,000 feet. I could hear the ghosts of those 19 year olds laughing and saying: "Grow some balls, buddy. We did it then so you can do what you do now."
The relief tube and the toilet near the back were interesting too. By far the biggest thrill was sitting in the nose on the tiny stool watching the world rush by and peering through the Norden (sp?) bomb sight. I heard a story (I think from my uncle who was a nose gunner/bombardier in a B-24) that they were instructed to destroy the bomb sight (preferably with their sidearm) if the plane was going down behind enemy lines. We didn't want anyone else to have one. He also told me that the crosshairs in the Norden were made from black widow spider web.
All in all a huge thrill for a WWII buff and aviation nut. I highly recommend it to anyone.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".