Had an interesting one during an afternoon nap today:
Dreamed I was in a moderate sized city, in a sort of shopping/entertainment district. I find a street with a one story white, windowless offices-sized building, so out of curiosity, I go inside and see that it's really, really old by how yellowed and curled-at-the-edges some of the placards on the walls and desks are. Also, the typeface on those placards lends the place a sort of 'disused military research installation' feel to it.
So I'm snooping around and find a stairwell leading down. Downstairs, it looks like a kind of a nursing home for retired military researchers. They're being kept there so that, in their various states of senility, they don't blab about what they were doing, which I get the feeling is still highly classified. At one point, I walk up to a table of these Top Secret oldsters and it occurs to me that I saw a placard with an arrow and the word 'Bridge' on it, and I start to suspect what they were working on. So I ask the oldsters if any of them still remembers where the bridge is.
Most of them don't even look up, but one old lady gives me directions and looks all smug 'cause she remembered. So, as directed, I find the elevator and hit the button for S25, which I somehow instinctively know is Sub-Level 25. Elevator goes down 25 floors and I step out into a Star Trek TOS corridor set -- except it isn't a set. There's a knocking sound coming from the technicolor pipes, dust on the concrete floors, the overhead lights are sort of dimmer than they should be and yellow-ish with age.
Then, after a while, I find the Bridge, the corridors were surrounding it along with some machinery rooms and in one corner a huge ass 1960s era mainframe computer in a shaft that goes another 20 floors down at least. Well, the Bridge isn't exactly like the TOS Enterprise bridge, it's more like the NX-01 bridge in layout but with TOS consoles and jellybean controls. Most of the consoles are either un-powered or just worn out with age, and the main viewscreen is just an absurdly huge 1960s tech black & white television that displays static when I turn it on.
I find one of those wedge-shaped TOS tablets and plug it in to a cigarette lighter power adapter on the big chair, and when it finally powers on, it has multitouch like an iPad but a ridiculously unintuitive operating system. All I manage to find on it is a log entry from a "station supervisor" detailing a visit from a G. Roddenberry, M. Jeffries, & W. Chang.
I'm like, "Uh huh, that figures."
Then I realize I'm gonna bust if I don't find someplace to take a piss, and start checking the various doors to the bridge to see which one leads to the head. That's about the time I wake up.