Some of Brooklyn’s darkest secrets lie in its hippest neighborhoods.

The borough’s scariest tales involve everything from a ghostly mansion in Park Slope to forgotten church cemeteries under a hip bar in Williamsburg to a buzzy but reputedly haunted Trader Joe’s in Cobble Hill — and you can learn about them on an offbeat, macabre history tour.

Allison Huntington Chase, the 38-year-old founder of Madame Morbid’s Trolley Tours, is tooling around droves of New Yorkers and tourists to the creepiest spots in town in a replica Victorian-era funeral parlor retrofitted onto a trolley.

Some tour-takers pass ”these sites every day, and now they know what it used to be,” Chase told The Post.

“They get a kick out of exploring their own neighborhood and being a local tourist.”

The 90-minute jaunt

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