The dungeon is complete with ashlar walls built of large blocks of locally quarried limestone with rivited iron windows and doors. The dungeon is complete with ashlar walls built of large blocks of locally quarried limestone with rivited iron windows and doors. While this relic of the past remains open for the occasional tour, the actual dungeon was only used for around 14 years due to backlash from area residents and officials who believed the punishment to be inhumane and barbaric.