POW camp
bastille
black hole
borstal
borstal institution
bridewell
brig
cell
concentration camp
condemned cell
death cell
death house
death row
detention camp
donjon
federal prison
forced-labor camp
gaol
guardhouse
house of correction
house of detention
industrial school
internment camp
jail
jailhouse
keep
labor camp
lockup
maximum-security prison
minimum-security prison
oubliette
pen
penal colony
penal institution
penal settlement
penitentiary
prison
prison camp
prisonhouse
reform school
reformatory
sponging house
state prison
stockade
stronghold
the hole
tollbooth
training school
abyss
alley
basement
bedroom
castle
cavern
cellar
cemetery
chamber
chapel
chasm
corridor
courtyard
crypt
den
fortress
pit
swamp
tomb
vault