adytum
ashram
asylum
bolt-hole
cache
cell
cloister
concealment
corner
cover
covert
coverture
cranny
cubby
cubbyhole
dark corner
den
dugout
foxhole
funk hole
hermitage
hideout
hidey hole
hiding
hiding place
hole
holy of holies
ivory tower
lair
mew
niche
nook
privacy
recess
refuge
retreat
safe haven
sanctuary
sanctum
sanctum sanctorum
secret place
stash
undercovert
area
army-issue
breakfast-room
confab
flintlock
four-room
lamasery
lava-flow
long-barreled
military-issue
small-caliber
stage-setting
tar-paper
timeshare
tin-roofed
tripod-mounted
tumbled-down
uncharged