The Castle

The Castle is the former/current headquarters of the Minutemen in Boston in 2287. It is built into Fort Independence and is located on the East of The Gwinnett restaurant and brewery.

Background
Before the War, it was known as Fort Independence. The Minutemen repurposed it as their headquarters in the Commonwealth until a colony of mirelurks forced them out and took it as their nest. Preston Garvey wants to reclaim the Castle for a new generation of Minutemen.

Once the main stronghold of the Minutemen, The Castle is a potential settlement for the player, but it is teeming with mirelurks and houses a mirelurk queen. These enemies must be defeated before the player can begin to build and attract settlers.

Layout
Inside the fort is a missile launcher and flamer, as well as a small amount of ammunition for each. Once settled, it comes with five free beds, a medic stand, chemistry workbench, starter lighting and electrical cable system, and an industrial water purifier good for 40 units of water should the player reintroduce power into the system.

After progressing through the minutemen questline, the mud and mirelurk egg clutches will be cleaned out and the player character will be able to reopen the armory, allowing them to build artillery pieces at allied settlements. Another notable feature is the rubble in one of the rooms can be removed in the workshop mode and reveal a hidden passageway to The Castle Sewers.

Inside the armory is a cache of heavy weapons, a weapon and armor workbench, and 3 free laser turrets that can be stored or redeployed elsewhere using the workshop.

Notable loot

 * Guns and Bullets magazine on the radio operator’s desk, in the middle of the Castle grounds, outside. Confirmed during Old Guns mission.
 * Fat Man in the armory accessible during/after Old Guns
 * Various laser musket upgrades in the armory

Appearances
The Castle only appears in Fallout 4.