Smithsonian Castle anecdotal hauntings

The Smithsonian Institution Building ('the Castle') on the National Mall is included in multiple local lists and articles about Washington haunted locations, with employees and visitors recounting isolated reports of unexplained noises and sensations within the historic building. Such accounts have been repeated in tour narratives and regional paranormal guides tied to the Castle's 19th-century origins and long institutional history. These accounts are anecdotal and have not been confirmed by scientific investigation.