Zero

Had a dream last night about going with a friend to an old-ass prison to record some video. We got permission to enter and we headed into the elevator, but somehow I blacked out on the ride down and when I came to, my friend was gone and the elevator was open on the wrong floor. I stepped outside into the dark halls only to be told by a guard that I should be careful of the ghosts that wander these halls (?). Not long after looking around, I spot a ghostly figure wearing American revolution-era clothes and I immediately bolted back to the elevator and hit the first floor button. What I wasn't expecting was for the elevator to again spit me out onto the wrong floor as I was greeted by an entire lobby of zombies waiting for the elevator. Why they were also having a dance party in the same room I have no idea. Somehow, there's now 5 or 6 different elevators to choose from, but every single one I try to get on has zombies already riding them. Eventually, I got back on the same elevator I arrived in and that's all I can remember from the dream. Why were elevators were so important to this dream anyway?