For what it's worth, the secret bunker Cheney used after 9/11 was located near Camp David at Raven Rock Mountain in Pennsylvania.
How do we know this? The following Knight-Ridder report about James Bamford's book A Pretext for War:
Known familiarly to government insiders as the "underground Pentagon," this is where Vice President Dick Cheney set up shop in the aftermath of the attacks on Sept. 11, 2001, and where he sometimes is when his office is being secretive about Cheney's whereabouts.
The location is a highly secure complex of buildings inside Raven Rock Mountain near Blue Ridge Summit, Pa., close to the Maryland-Pennsylvania state line and about seven miles north of Camp David.
The year this article was published? 2004.