Videos that make the ground transparent and look up at the town from underground

It is CM of the Madrid subway, but the landscape I usually get used to is looking strange when I look up from the bottom. I think that it is impossible to see the ground on such a close distance as it is in the position of the subway that is actually running, but it seems interesting if it really makes such a subway.

Playback is from the following.
Somehow the sky seems to be very beautiful.
YouTube - Transparente | Metro de Madrid


Bonus
Also CM of the Madrid subway. The story of a little man who could be torn in love.
YouTube - anuncio metro madrid


A group scribbling in the gap where the train stopped
YouTube - Graffiti @ Metro Madrid (Linea 5)