a secure, undisclosed location

I now live about 1/2 mile from Dick Cheney. Not that you'd know it without doing some research. The house of the No. 2 executive is harder to get close to than his boss' house.
The grounds of the US Naval Observatory, where the Vice President residence is located, is completely fenced off and all entry points are guarded. That's not so surprising. The fact you can barely catch a glimpse of the house from the street isn't surprising. This being DC, the fact there is no sign or other acknowledgement it is theVP's residence is a bit surprising.

The real surprising thing is that you can't even see the place online. At least not with Google maps or Google Earth. Yahoo! maps still has the area in high resolution, at least last time I checked.