The Hoover Dam is rumored to be haunted by the ~100 workers who died during its construction in the 1930s, with some reports of shadowy figures and disembodied voices. A significant legend suggests some workers fell into the wet concrete and became permanently entombed within the dam. The nearby Boulder Dam Hotel is also considered haunted, with reports of unexplained noises, apparitions, and flickering lights. The most pervasive legend states that some workers who perished during the dam's construction were mixed into the concrete, and their spirits still linger within the massive structure. Visitors and staff have reported sightings of shadowy figures and hearing disembodied voices echoing through the dam's tunnels and structures. Boulder Dam Hotel Haunting Experiences: Guests and staff at the historic Boulder Dam Hotel have reported hearing ballroom music and conversations when the hotel was closed. Guests have also heard faucets running in an empty bathroom and experienced doors slamming shut behind them. Reports include flickering lights and the feeling of not being alone, with some guests claiming to have seen ghostly figures, according to a TripBucket report. Room 209 is particularly known for its paranormal activity, with reports of flickering lights and apparitions.