Did you know there’s a mass grave of 30,000 bodies beneath a Williamsburg arcade? Another fun fact: A Park Slope mansion built by the inventor of Chiclets gum might still be haunted by the ghosts of his household staff. And if you’ve ever stopped by the Trader Joe’s on Court Street, rumor has it the building itself has a few lingering spirits.

These are just some of the stories shared aboard Madame Morbid’s Trolley Tours , a 90-minute journey through Brooklyn’s darker side.

Guests step onto the trolley and straight into the 19th century, greeted by a waft of fog and vintage music. Over the next hour and a half, they travel past landmarks such as the Brooklyn Naval Cemetery, McCarren Pool and the site of the 1876 Brooklyn Theatre fire — all while learning about true crime, tragedy

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