So I set off to make a batcave. And as I did so, I realized this a whole lot more complicated then I wanted it to be. So scaled back, read some more recent issues and decided on something that would sort of make sense to old bats. A bat "bunker". Middle of the city, a normal townhouse hides the location, the bunker isn't equipped for batmobile storage, or batplane, but relies on motorcycles for quick travel via the gotham subway and sewer systems.