I guess I do not get a creepy vibe from old buildings. Instead I try to read their histories. What creeps me out are McMansions that have a mishmash of architectural styles, the intersection of wealth and bad taste. I find that unsettling. Once I visited Biltmore, in Ashville NC on a motorcycle trip, and I can only describe it as the place where Good Taste went to die. Built at a time when giants who were redefining American Architecture were rebuilding Chicago. The designer of Biltmore was an incompetant. I feel the same way about the mansions in Newport RI. For real creepy stuff, see McMansion Hell
Ground Zero...often considered the most haunted place in Nevada:
Looks blasé on the outside...but the inside gives off quite another vibe entirely.