POW camp
abatis
advanced work
balistraria
bank
banquette
barbed-wire entanglement
barbican
barricade
barrier
bartizan
bastille
bastion
battlement
black hole
borstal
borstal institution
breastwork
bridewell
brig
bulwark
calaboose
can
casemate
cell
cheval-de-frise
circumvallation
concentration camp
condemned cell
contravallation
cooler
coop
counterscarp
curtain
death cell
death house
death row
demibastion
detention camp
dike
drawbridge
earthwork
enclosure
entanglement
escarp
escarpment
federal prison
fence
fieldwork
forced-labor camp
stoccade
fence in
fortification
munition
palisade
surround
wall
stockaded
stockades
stockading
barrack
blockhouse
breastworks
citadel
corral
fortress
hangar
hovel
inclosure
paddock
perimeter
planking
portcullis
rampart
redoubt
scaffolding
shack