I hadn't realized the parking situation was so desperate in San Francisco that someone was forced to install a secret garage in their ground floor! To please the city council, the architects retained the Upper Haight house's facade, which you can see actually revolves and folds in the video here, allowing four cars to enter and exit.

Now that's a batcave, Victorian-style. [Beausoleil Architects via SFCurbed via The Daily What]