I go to Gowanus often and never heard of the Batcave. So I am thrilled to be able to explore it ... before it gentrifies! Read the full history here.
Known best for the ever-changing political graffiti on its overhang, visible from the 4th Avenue 9 Streets stop on the F and G train, the building is now empty save the furniture and belongings of the people who had lived there.
Currently being cleaned of an excessive build-up of moldy books, mattresses, and plush toys (albeit the graffiti remains relatively untouched), the building was recently bought and is being developed into an art center and bicycle velodrome.