Las Vegas, Nevada
One of the oldest still-standing casinos on the Las Vegas Strip, the Riviera Hotel & Casino is notorious for its connection to the Mafia -- it's believed to have been the site of numerous mob-related murders. Today, hotel workers routinely hear voices in the stairwells and feel the presence of the no-longer-living when cleaning the top-floor suites. When the Ghost Adventures crew held an overnight lockdown, they found they were not the only ones occupying the hotel's ninth floor. Be sure to check back each Tuesday to learn about a new Haunted Destination of the Week.