Advanced settlement structures

The advanced settlement items are unlocked by meeting specific criteria:
 * Picking up Fallout 4 magazines, such as Picket Fences and specific issues of the Wasteland Survival Guide.
 * The Cabot House quest line also unlocks a set of portrait paintings.
 * located in : (Build &rarr; Decorations &rarr; Wall decorations &rarr; Paintings)
 * Being friendly to specific factions unlocks flags.
 * located in : (Build &rarr; Decorations &rarr; Wall decorations &rarr; Flags)
 * At The Castle, during the quest Old Guns given by Preston Garvey, you will be asked to build and test fire an Artillery piece. Upon completion of this quest and making this location a settlement, you will be able to build this cannon at all other settlements.
 * located in : (Build &rarr; Special)
 * At Bunker Hill, after completing Traffic Jam given by Deb, and Prep School given by Kessler, you will be able to build Caravan Trade Posts at settlements.
 * located in : (Build &rarr; Resources &rarr; Misc)

Misc
Issue #4 Wasteland Survival Guide offers a new decoration item, the lawn flamingo.