It is creepy and I would feel so strange an uncomfortable in there. I would be afraid they would close the gates with me still in there!
The thought of having to wake up in a place like this and losing my freedom is so strong when I see photos like these it sends chills up and down my spine.
Ok...I cheat....it is Alcatraz, what you cannot see is the army of tourists plodding through and getting in the way of most decent photo opportunities :-)