“99 Door Mansion,” also known as Caledonia House, is a colonial-era estate house built in the 1840s on the Byram plantation in Nibong Tebal and long abandoned within surrounding palm oil fields. Local legend centres on a 1948 murder on the estate, after which the mansion was reportedly left to decay, fuelling stories of female apparitions in upper corridors, footsteps echoing through empty rooms, and doors slamming despite no wind—details that directly tie into its unusual layout of numerous internal doorways. Explorers frequently describe intense disorientation inside the structure, with identical door-lined halls and the sensation of being watched, which has made it a recurring subject in Malaysian urban-exploration and paranormal investigations. Its isolation on plantation land and layered colonial history have cemented Caledonia House as one of Penang’s most recognisable abandoned haunted mansions