Re: Queen Mary
Spent a weekend on it for a convention. The ship is, of course, docked safely and permanently down near LA. All the luxury, none of the worries. The layout was close enough to the Titanic to be a little eerie.
The decks are actually slightly curved up at either end. Very obvious if you're looking down a long hallway. I liked to pretend it was the floor of a huge, circular space station...
Nearby is an old Russian submarine that does tours. Holy crap, now that's claustrophobia.