You take a final look back at the Library. A monstrosity, yes, but one in which your feet have learned to find their path. Then you turn, and leave it behind for good.

A vending automaton sells you a permit, and you present it to the metro to be allowed entrance. As you ascend from the tunnels near the central station, the metro station disappears behind you, to conceal itself from any other travellers arriving in Warsaw. But you will remember the way, should you ever return.