The Palace Theatre in Manchester, New Hampshire represents a significant example of early twentieth-century entertainment architecture, having been opened to the public in 1915 during the golden age of American vaudeville and theatrical performance. The building was constructed to serve as a venue for live theatrical productions, musical performances, and other forms of entertainment that characterized the vibrant cultural life of early twentieth-century American cities and towns. The Palace Theatre's design reflected the grandeur and architectural ambition typical of theaters built during this era, with ornate interior decoration, sophisticated lighting and acoustical systems, and significant investments in audience comfort and visual spectacle. The venue hosted numerous theatrical productions and musical performances throughout its operational history, establishing itself as an important cultural institution within the Manchester community. Over more than one hundred years of continuous operation, the Palace Theatre has accumulated not only a rich history of entertainment and cultural significance but also an extensive body of documentation regarding paranormal phenomena. The paranormal phenomena at the Palace Theatre have been extensively investigated by professional paranormal research teams, including the New Hampshire Paranormal Investigators, whose work at the location has been featured on paranormal investigation television programs. The most prominent and well-documented apparition at the Palace Theatre is that of a female entity, identified by investigators and theater staff as Mary, whose ghostly presence has been repeatedly observed in backstage areas and other interior spaces of the theater. Witnesses describe encountering a female apparition dressed in what appears to be early twentieth-century clothing, consistent with the era when the theater first opened and when Mary's presence is believed to have become established. The apparition of Mary has been observed by multiple independent witnesses and has been documented with sufficient consistency to be considered one of the most credible female ghost sightings at an American theater. The concentration of Mary's manifestations in backstage areas suggests a strong connection to the theatrical production aspects of the building, potentially indicating that her death or most significant life experiences were connected to theater work or entertainment activities. Beyond the apparition of Mary, the Palace Theatre has become known for additional paranormal phenomena documented throughout the building, particularly in the balcony section and backstage areas where much of the theatrical infrastructure and equipment is located. Witnesses have reported encountering a mysterious apparition of an unidentified man, whose purpose and identity remain subjects of speculation among paranormal researchers. Disembodied voices and unexplained sounds have been frequently reported throughout the theater, including vocalizations that appear to be connected to theatrical performances or audience reactions, suggesting spirits reenacting scenes from the theater's past. Electronic voice phenomena recordings have captured voices and utterances that appear to originate from paranormal entities rather than identifiable human sources. Moving objects, including theater props and equipment, have been observed to shift position or animate without visible cause, while stage lighting and other technical equipment display erratic behavior interpreted as paranormal interference. Cold spots have been consistently documented in particular areas of the theater. The paranormal investigation and documentation of the Palace Theatre has contributed significantly to the body of evidence regarding haunted theaters in the United States, establishing the location as one of the most credible and thoroughly researched haunted entertainment venues. The involvement of professional paranormal research teams in documenting the phenomena has elevated the credibility of accounts beyond anecdotal reports, introducing systematic investigation protocols and technical monitoring equipment that provide objective documentation of paranormal activity. Television paranormal investigation programs have featured the Palace Theatre, bringing broader public attention to the phenomena and contributing to the location's reputation as one of the most actively haunted theaters in America.