This outfit is run by a husband-and-wife pair who team with important historic sites around the city to not only lead tours, but help them build out their on-site museums and oral history projects. This means that a lot of what you’ll learn on their history-rich outings come from direct research (and not from reading someone else’s books), making the tours unusually compelling. Turnstile is the sole tour operator for the Brooklyn Navy Yard and Brooklyn Army Terminal; it also offers food-cart tours, and Prospect Park tours.