In the courtyard of buildings 199–201 on the Obvodny Canal Embankment, there is an old metro car.
It appears to be literally driving into the wall of one of the local brick buildings, with the installation complemented by highly realistic graffiti.
The train car itself—or rather, a part of the car—is genuine. The electronic display, which shows the time, date, and air temperature, is also real.
Address: Obvodny Canal Embankment, 199–201