Nelsen's Hall and Bitters Pub is reportedly haunted by its founder, Tom Nelsen, who died in the building in 1960. Visitors and paranormal investigators have reported a presence or energy within the building, experiencing mysterious occurrences such as doors closing on their own and unexplained footsteps. Nelsen's Hall is a popular spot for ghost hunters and has even been featured on the TV show "Haunted State" for its abundant paranormal activity. The original owner of the establishment, Tom Nelsen, founded the hall in 1899 and was instrumental in popularizing the Angostura bitters tradition. He passed away in one of the upstairs rooms of the hall in 1960. Nelsen is believed to still be present in the building, with visitors reporting a feeling of his presence, especially near the bar. People have reported hearing unexplained footsteps and feeling a distinct presence or energy in the building, particularly around the bar and in the bathrooms. Reports include doors that close unexpectedly when they shouldn't and other subtle signs of activity.