Adelaide Gaol held its first prisoner in 1841 and executed forty-five condemned men and women within its bluestone walls before closing in 1988. The sandstone cellblocks, built by convict labour using locally quarried materials, still bear the scratches and messages carved by inmates awaiting death by hanging. The execution yard remains intact, its gallows trap door operated by the same lever mechanism that ended lives between 1840 and 1964. The complex spans two hectares at 18 Gaol Road, Thebarton, preserving 147 years of incarceration history across radial wings designed according to the separate system — a nineteenth-century penal philosophy that isolated prisoners in solitary cells to enforce reflection and reform. The administration block, chapel, and condemned cells occupy the northern quadrant. Cell Block H, added in 1869, housed the colony's most dangerous offenders in single occupancy rooms measuring two metres by three metres. The hanging tower, positioned above the exercise yards, allowed multiple public executions before South Australia abolished capital punishment in 1976. Today the site operates as a heritage museum under state conservation management, preserving architectural features that document the evolution of criminal justice in colonial and modern Australia. The bluestone perimeter walls, standing four metres high, enclose exercise yards where prisoners spent one hour daily in silence. Original gas lighting brackets remain fixed to corridor walls. The chapel retains its cedar pews and iron-barred gallery where female prisoners attended services separated from male inmates. Adelaide gaol ghost tour and paranormal investigation experiences grant after-hours access to restricted zones including the condemned cells, execution chamber, and solitary confinement wing. Professional paranormal investigation equipment — EMF meters, digital recorders, infrared cameras — is provided for participants conducting evidence-gathering sessions in documented high-activity locations. The morgue, located beneath the hospital ward, and the punishment cells in the basement report consistent electromagnetic anomalies and temperature fluctuations recorded since 2003. Multiple investigation teams have documented unexplained voice phenomena in Cell 14, where the last execution took place, and shadow movement in the chapel gallery where three prisoners died during a riot in 1872.