On your way up Philopappos you will pass a small cave which is supposed to be the prison of Socrates, but there is no proof of this, and it is much more likely to have been imprisoned in the state prison in the ancient Agora.
During WWII artifacts from the Acropolis and National Archaeological Museum were secreted here, sealed behind a wall.
Jacques-Louis David:1787
The Death of Socrates , Oil Painting
The many holes on the surface of the rock (see above) were used to sustain wooden beams. There must have been a two- or three-story structure in front of these caves. It is now known when they were made, nor what was the nature of the building