Deathclaw Sanctuary

Deathclaw Sanctuary: Located in the Northwestern region of the map, South - South-West of Fort Constantine, between Dickerson Tabernacle Chapel and Broadcast Tower KB5.

Tips

 * Fortunately, the tunnels are ideally suited for stealth play, allowing patient explorers to retrieve Vengeance without engaging any of the Deathclaws. Alternatively, most (all?) of the Deathclaws follow paths through some of the narrow tunnels, so it's also an excellent place to combine stealth with mines. You can find a good two dozen Frag Mines on the bodies scattered around (the exact number may be somewhat random), but bring your own Bottlecap Mines for quicker results.
 * If you're having a hard time seeing in the darkness, adjust your brightness. This will let you clearly see everything, and won't give away your position like the Pip-Boy flashlight does.
 * When engaging or alerting a Deathclaw its best to put your back to the wall and fight, this serves a dual purpose, it keeps the player from backing into additional Deathclaws, and its safer (attacks from behind are part of Deathclaw A.I.).

Loot

 * There is a locked footlocker right outside the cave entrance which contains various guns, ammunition, stimpacks, and a Duck and Cover! book. There is likely to be a Deathclaw outside the entrance, too.
 * Endurance Bobblehead to the right when you walk in, near a pile of corpses and a Rotting Brahmin. Also here:
 * A Mini Nuke
 * A Nuka Cola Quantum
 * A Nikola Tesla and You
 * Vengeance in the far southeast of the caves
 * Jack (Depends on main quest timeline)
 * Duck and Cover in the locked footlocker out front
 * A fairly rare Roving Trader Hat (+5 to Barter) among the second pile of bodies to the right (east) of the entrance
 * There's an Enclave soldier that randomly spawns in the cave wearing Tesla Armor, if you haven't cleared the sanctuary beforehand this solider may be found dead (preyed upon by Deathclaws).
 * There are about seven heaps of corpses and body parts scattered through the cave. Each heap has 2-3 lootable corpses. A couple of the corpses are traveling merchants who have the Trader Hat and Outfit, about 200 caps, and a fair amount of other mediocre stuff.