Surprisingly, many of the more fantastical locations in the Ghostbusters films are real places. Dana's apartment, Spook Central, is a real apartment building in New York it was just significantly smaller, and without that scary top, before post-production matte paintings and the like fleshed it out. Even cooler, that subway tunnel the Ghostbusters get lowered into to examine the river of slime in the second film? Also real. The one-block-long tunnel was built prior to any other subways in the area and without any City approval, to demonstrate a pneumatic transit system before the subway actually existed.