Bath's Georgian façades conceal two thousand years of restless dead. Roman soldiers who drowned in the sacred spring, medieval monks walled alive in abbey crypts, and sedan-chair bearers murdered for a shilling all walk the limestone lanes after dusk. The city's honey-coloured stone holds memory like a sponge — archaeologists drilling beneath the Pump Room in 1979 found three burial strata, each civilisation interring its dead atop the last. The Bath ghost walking tour tradition began in 1974 when historian Edmund Rack catalogued forty-seven documented hauntings within a half-mile radius of the Abbey. His research revealed patterns: sightings cluster near Roman water conduits, manifestations peak during autumn equinoxes, and witnesses consistently describe the scent of sulphur preceding apparitions. The tours follow Rack's original routes through narrow snickets where gaslight once flickered — Theatre Royal's Grey Lady corridor, the Garrick's Head cellar where a barmaid was bricked in during the 1730s, and the subterranean passages linking abbey to bishop's palace. Modern paranormal investigators record electromagnetic anomalies at seventeen tour waypoints. The Assembly Rooms basement registers temperature drops of eleven degrees within seconds. Sally Lunn's kitchen — where a Huguenot refugee died of plague in 1665 — produces EVP recordings in archaic French. Thermal cameras capture cold spots shaped like human silhouettes in doorways that once led to execution yards. These phenomena draw researchers from Edinburgh's Koestler Parapsychology Unit and the Society for Psychical Research, who conduct controlled experiments during tour intervals. The Georgian city's grid layout creates acoustic peculiarities that amplify whispers across Queen Square and the Circus. Guides demonstrate how voices carry through ventilation shafts installed by John Wood the Elder, allowing eavesdroppers to monitor seventeen households simultaneously. This architectural espionage network, combined with Bath's role as Regency England's social crucible, generated scandals that ended in duels, poisonings, and suicides — each tragedy adding another layer to the city's spectral catalogue. Evening tours reveal how architecture, history, and folklore interweave to create Britain's most densely haunted urban landscape.