Nestled in the town square of Concord, Massachusetts, the windows of the Colonial Inn have gazed upon more than three centuries of bloodstained history.

Known for its role in the American Revolution, the Inn was originally built as three separate buildings with the oldest section of the property dating back to 1716. A stone's throw from Old North Bridge, the Inn is notoriously haunted by the ghosts from its Revolutionary War past. Guests report phantom footsteps, disembodied voices, and spirited soldiers lurking in the shadows of the labyrinthine hallways and empty rooms of this infamous inn.

Local author Sam Baltrusis has worked the graveyard shift at Concord's Colonial Inn trying to unravel the chilling mysteries and lingering legends associated with one of the country's oldest and most haunted hotels.

Sam Baltrusis, author of Ghosts of Salem and featured in The Curse of Lizzie Borden shock doc, has penned more than a dozen paranormal-themed books, including Haunted Hotels of New England and Ghosts of the American Revolution . He has been featured on several national TV shows, including the Travel Channel's A Haunting, Most Terrifying Places, Haunted Towns and Haunted USA . Baltrusis is a sought-after lecturer who speaks at libraries and paranormal-related events across the country. In the past, he has worked for VH1, MTV.com, Newsweek and ABC Radio and as a regional stringer for the New York Times . Visit SamBaltrusis.com for more information.