MBTA Blue Line - Aquarium Station.
Yes, it really does slope downhill like that. To really see how steep it is, look at the way they had to stagger the blue stripe and the other patterns on the walls.

Photographed by Mark Sylvester, January 21, 2008.
Added to the photo archive by Mark Sylvester, January 22, 2008.
Railroad: MBTA.

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