Calvary Cemetery in Sioux City, Iowa, is rumored to be haunted, with visitors reporting unexplained phenomena and eerie sensations. As Sioux City's second-oldest cemetery, it has a long history that contributes to its unsettling reputation. Visitors have reported unexplained ringing in their ears and the sensation of cobwebs draping over their faces, with these feelings intensifying when approaching a particular grave. The legend behind the cemetery's most notorious haunted spot is a grave with a headstone carved from a tree. This tree is rumored to have once been used for hangings, and the unsettling feelings are strongest when near it. In 2021, a visitor claimed to have seen a full gray apparition of a man running through the cemetery. The specter reportedly turned into a mist and vanished. Coincidentally, a fresh grave was later found in the same area where the ghost was last seen. Another visitor in 2016 reported the pervasive and unpleasant smell of a dead animal while searching for an ancestor's grave. The odor appeared to follow them as they moved through the cemetery. Some have reported seeing black shadow figures lurking in the distance, though it's important to note some sightings have been attributed to more mundane causes.