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vaulted cellar
wall tunnel
catacombs
tunneled
tunnels
karez
amphipolis
the limestone cave entrance
passageway
caravansary
cisterns
corregidor
mine shaft
grotta
antechamber
douaumont
pillbox
souterrain
longues-sur-mer battery
fort of santa catalina
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vaulted cellar
wall tunnel
cerveteri
passageway
culvert
passageways
the limestone cave entrance
hollow way
roccaforte
fort of santa catalina
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mine shaft
vaulted cellar
souterrain
maeshowe
serapeum
passageways
subterranean
wieliczka salt mine
longues-sur-mer battery
douaumont
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wall tunnel
vaulted cellar
mine shaft
railway tunnel
torii tunnel
lötschberg tunnel
bunker
train tunnel
passage
hollow way
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catacombs
tunneled
souterrain
railway tunnel
wall tunnel
subterranean
vaulted cellar
cavernous
longues-sur-mer battery
hollow way
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maeshowe
caravansary
cellar
vaulted cellar
catacomb
wall tunnel
passageway
montresor
catacombs
passageways
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tunnel
tunnels
longues-sur-mer battery
railway tunnel
catacombs
vaulted cellar
passageway
corridor
wall tunnel
passage
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passageways
eastern state penitentiary
passageway
serapeum
douaumont
vaulted cellar
souterrain
tunneled
wall tunnel
casemates
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amphipolis
serapeum
longues-sur-mer battery
maeshowe
douaumont
vaulted cellar
eastern state penitentiary
storerooms
burial chamber
passageways
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longues-sur-mer battery
vaulted cellar
railway tunnel
maeshowe
tunnelled
souterrain
tunneled
wall tunnel
undergrounds
waggonway
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stone stairway
stone stairs
passages
cerveteri
herculaneum
passageway
stairway
passageways
mycenae
stairways
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cellar
vaulted cellar
catacombs
catacomb
empty tomb
amphipolis
burial chamber
serapeum
maeshowe
mine shaft
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fort of santa catalina
caravansary
vaulted cellar
casemate
old fort
catacomb
longues-sur-mer battery
cisterns
fortifications
catacombs
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passageways
jahili fort
corridor
vaulted cellar
passageway
fort of santa catalina
anuradhapura
storerooms
old fort
agraharam
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vaulted cellar
culvert
charcoal kiln
catacombs
mine shaft
tunel
tunnel
tunnels
subterranean
tunnelled
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eastern state penitentiary
maeshowe
passageways
railway tunnel
vaulted cellar
corridor
passageway
lötschberg tunnel
wall tunnel
wieliczka salt mine
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vaulted cellar
longues-sur-mer battery
passageway
passageways
corridor
casemate
hallway
maeshowe
doorways
corregidor
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vaulted cellar
western wall
passageways
wall tunnel
eastern state penitentiary
wailing wall
portcullis
corridor
passageway
mycenae
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catacombs
catacomb
porticus
uxmal
casemate
herculaneum
storerooms
vaulted cellar
archways
knowth
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vaulted cellar
karez
catacombs
cisterns
catacomb
vaults
nabataean
empty tomb
vaulted ceiling
caravansary
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vaulted cellar
longues-sur-mer battery
corridor
passageways
fortifications
modlin fortress
hallway
wall tunnel
subterranean
umayyad palace