Raven Rock

 is the Enclave's main base of operation in 2277. It can be found in the northwestern part of the Capital Wasteland. The base itself is not accessible during freeform play; you arrive here after Finding the Garden of Eden and escape during The American Dream, and the entrance seals behind you.

Notable Loot
There is an immense amount of loot available at Raven Rock including the rare Tesla Power Armor, Plasma Rifles, Enclave Power Armor, AER9 Laser Rifles and Gatling Lasers. So before you leave Little Lamplight for Vault 87 make sure you only take the essentials as you'll find much more than you can carry, because after you leave it the door seals for good. Also, be sure to grab the Energy Weapons Bobblehead, located in sector 2C in a room to the northwest.

Bugs

 * The outer hatch can be blown off from the outside by small arms fire (but not grenades). If you enter the complex (before The Waters of Life quest), you will be blocked from further entry by an invisible wall. When you leave, you will trigger the event where Colonel Autumn's Vertibirds flee the compound.


 * Upon returning to Raven Rock after completing the associated quest, one finds Enclave soldiers in fleeing mode. Killing them and looting their bodies is a trivial matter, with various types of Power Armor and Energy Weapons to be found on their corpses. Allowing a few days to pass and returning finds the same soldiers fleeing, along with their power armor free for the taking yet again. Whether this is a bug, or possibly Bethesda's way of giving easy access to repair parts, is unknown.


 * It is possible to climb on top of Raven Rock, but there are no exits for the shafts you can see inside. There are no Vertibirds there, they might spawn later on in the game as a result of the storyline. There are no enclave soldiers there. To get on top of the mountain, leaving the Raven Rock Level 1 entrance, go to the left, and eventually you'll find a path that you can jump to get to the top.


 * It is also possible to go back inside Raven Rock! (You will only be able to go as far as the room with Eden in it.)  Right after you exit Raven Rock Level 1, don't go futher and activate the outer hatch.  Instead, fast travel to a location and later fast travel back.  The door will be wide open and you can shoot it as mentioned above and jump through the doorway and get back inside.  (Make sure you save before doing this as I am not sure if it works every time, and also I don't know if Fawkes will be in the underworld and it gets rid of your chance to have him as an aly or not.)

Appearances
 only appears in Fallout 3.

Behind the scenes

 * Raven Rock Mountain Complex is a real-world government complex that became operational in 1953.
 * is the name of a settlement on the island of Solstheim in the Bloodmoon expansion of Bethesda's The Elder Scrolls III: Morrowind, and, oddly enough, is located near the Raven Rock in Fallout 3 (Northwest corner). It is also referred to in The Elder Scrolls IV: Oblivion by some people on the Waterfront.