Let's start with windows. Danish windows are different from those in other countries. They are opened outside, and are equipped with a whole set of different hooks.
An interesting installation, which I saw on someone's balcony. It's a menora and Jack O'Lantern.
A fire-cock and a pumpkin.
Trains in Copenhagen's subway are controlled from the central console, there are no drivers. Since there is no driver's cabin, one can look directly into the tunnel.