on one busy downtown street is a flashpoint of warsaw's volatile past, mokotow prison. >> been to over 20 american prisons. they're usually located in remote areas far from cities for security reasons. so we're on these busy warsaw streets and we turn and these massive blue doors open up and we enter into this facility. and when we were inside and i was standing on prison grounds, i would look up and see apartment buildings surrounding us, businesses. >> the prison was built in 1904. it used to be called the place of no return. between world war ii and the fall of communism in 1989, it housed a countless number. of freedom fighters, many of whom were tortured and killed in mass executions. the monument on the prison wall honors the victims. >> there are probably over 1,000 people who had been tortured and executed at this prison during the various regimes. there were a number of staff members who made a comment to me that they felt they've seen ghosts there, they have felt ghosts there, that there's just a weight of what has transpired at that particular prison. >> today, mokotow house