In my dream, there was a well-known tunnel in Oxford that led from a very small college up to High Street where I was staying. The dream High Street, of course, did not resemble the real-life one at all.
The tunnel itself was the standard-issue concrete basement type, lit by a very few flourescent lights (so mostly was dark) and painted with that glazed paint they always use. Part of the time, I was walking down the tunnel, from a darker area to a lighter area. Part of the time, I was trying to find its entrance.
And that was the dream. Go figure.