I've posted different shots of this before. Overlooking the town of La Cabrera and the vast expanse of the plains of the Southern Spanish Meseta.
Unless there is one I have yet to discover, I reckon this is the largest rock window in the Sierra de La Cabrera.
The main Madrid Burgos N1 motorway cuts across the picture.
Sight and Sound: Well there is a window theme here! www.youtube.com/watch?v=f5B3m1ylEfI