Ghosts & Gravestones (866-754-9136, ghostsandgravestones.com/boston, pictured): This trolley tour—hosted by a frightening cast of characters—explores historic cemeteries, haunted hotels and chilling murder sites seven days a week through Halloween, and weekends through November 13.

Boston Night Tour (877-343-8257, bostonsupertours.com): A new tour run on weekends by the folks at Boston Super Ducks, this ghostly trip through the city is hosted by the same historians who lead Freedom Trail tours by day and know Boston’s history down to its last ghoulish detail.  

Haunted Harvard Square Ghost Tour (617-520-4030, cambridgehistoricaltours.org/ghost-tour): Take a terror-filled trip across the Charles River to experience Cambridge Historical Tours’ walk through the dark heart of the home of venerable Harvard University. It’s available to groups only, so round up the gang for this spirited sprint led by Victorian-era costumed guides.

Boston By Foot’s Beacon Hill with a BOO! (617-367-2345, bostonbyfoot.org): A popular annual event taking place October 31 at 6 p.m., this chill-inducing look at Boston’s Brahmin stronghold dwells on real-life tales of grisly murder, condemned heretics and serial killers while taking in elaborate decorations and mingling with costumed trick-or-treaters.

Haunted Boston Ghost Tours (800-979-3370, hauntedboston.com): Enjoy a 90-minute, family-friendly jaunt through some of the Hub’s most supernatural settings, including Beacon Hill and Boston Common. Expert guides recount tales of haunted subway tunnels, Colonial-era cemeteries and more, all grounded in historical fact.