The Wall is over 300 miles long and 700 feet high and made of ice, and constitutes the extreme northern border of the Seven Kingdoms of Westeros, separating the North from the Land of Always Winter. It has been guarded by the Night's Watch for over 8,000 years, ever since it was constructed, according to popular myth, by Brandon the Builder. The Night's Watch has constructed 19 garrison castles to the south of the wall, but only Castle Black, Eastwatch, and The Shadow Tower are held with any strength. None of the castles were built for defense, so that the Night's Watch could never successfully rebel against the realm.
Beyond the wall live the wildlings, the Others, the giants, and other creatures from the Age of Heroes, against whom the Night's Watch is charged with defending the realm. Many of these denizens are organized in a loose confederacy under the King Beyond the Wall, currently Mance Rayder.
Source(s): The Wall
Locations
The Wall Castles
From West to East
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615849-wall-castle-app-westwatchbythebridge Short description here.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615845-shadow-tower-server-build/post/37369479#p37369479 Short description here.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615874-wall-castle-application-sentinel-stand Short description here.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615831-wall-castle-application-greyguard Short description here.
One of the larger castles on The Wall, abandoned long ago but a good candidate to re-garrison.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615884-project-application-hoarfrost-hill Short description here.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615878-wall-castle-application-icemark Short description here.
- The Nightfort
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615887-wall-castle-nightfort Short description here.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615886-wall-castle-application-deep-lake Short description here.
- Queensgate
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615840-wall-castle-application-queensgate Short description here.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615877-wall-castle-black-redo-500-cst-saturday Short description here.
The castle nearest Castle Black, just to the east.
- Woodswatch-by-the-Pool
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615818-project-application-woodswatchbythepool Short description here.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615892-project-application-sable-hall Short description here.
- Rimegate
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615802-project-application-rimegate Short description here.
- Long Barrow
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615786-wall-castle-application-long-barrow Short description here.
A small ruined keep.
Old Forum: http://westeroscraft.com/forum/m/12700545/viewthread/6615782-greenguard Short description here.
- Eastwatch-by-the-Sea
Short description here.
Source(s): The Wall
North of the Wall
- Cave of the Last Greenseer
Short description here.
- Craster's Keep
Short description here.
- Fist of the First Men
Short description here.
- Thenn
Short description here.
- Whitetree
An abandoned village in the shadow of one of the largest known weirwoods.
- Hardhome
The closest thing to a town in the lands beyond the wall, but long abandoned and said to be a cursed place.
Source(s): The Wall