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vaulted cellar
casemate
catacombs
crypt
burial chamber
cisterns
vaults
grotta
mine shaft
undercroft
subterranean
cistern
pigeon spring
the limestone cave entrance
tunnel
souterrain
clonfert
pillbox
frigidarium
antechamber
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vaulted cellar
culvert
subterranean
portcullis
mine shaft
entrenchments
burial chamber
roman bath
cerveteri
charcoal kiln
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vaulted cellar
souterrain
limekiln
the water shed
acequia
undergrounds
clearwell
undercroft
passageways
subterranean
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vaulted cellar
roman bath
cerveteri
sepphoris
roman excavation
gruta
hibernacula
stone oven
portcullis
kalo chorio
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vaulted cellar
casemate
culvert
bunker
mine shaft
batterie de longues
longues-sur-mer battery
fortifications
charcoal kiln
two-stage lock
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stone gate
nymphaeum
burial chamber
part of the ruins
doorway
portcullis
vaulted cellar
mausoleum ruins
kinneil
wukoki puebloan ruin
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vaulted cellar
stone oven
charcoal kiln
grotto
casemate
stone gate
mine shaft
old window
celler
pigeon spring
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the limestone cave entrance
burial chamber
subterranean
cave church
stone stairway
torii tunnel
cueva
vaulted cellar
gruta
mine shaft
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stone gate
limestone arch
cerveteri
archway
the limestone cave entrance
burial chamber
bomarzo
rock gate
wukoki puebloan ruin
el arco
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water spring
burial chamber
the limestone cave entrance
pigeon spring
temazcal
yaxchilan
stone oven
the water shed
charcoal kiln
vaulted cellar
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vaulted cellar
charcoal kiln
stone oven
cerveteri
mithraeum
casemate
burial chamber
nymphaeum
culvert
temazcal
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culvert
railway tunnel
vaulted cellar
gapstow bridge
undercroft
stone bridge
aqueduct
the water shed
chapel bridge
the limestone cave entrance
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casemate
vaulted cellar
limekilns
wall tunnel
tunnel
waggonway
clonfert
vaults
embrasure
fortification
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vaulted cellar
mine shaft
charcoal kiln
the limestone cave entrance
burial chamber
temazcal
stone oven
subterranean
hibernaculum
mining site
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vaulted cellar
cerveteri
mithraeum
roman bath
the limestone cave entrance
passageways
umayyad palace
archway
three centered arch
corridor
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archway
passageway
passageways
doorway
doorways
vaulted cellar
kinneil
corridor
entrances
clonfert
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cave on the water
the limestone cave entrance
aqueduct
cerveteri
water spring
pigeon spring
water channel
crescent spring
the source of the danube
source de la sorgue
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the limestone cave entrance
vaulted cellar
mill wheel
mine shaft
wattle and daub
culvert
penstocks
storehouses
charcoal kiln
portcullis
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vaulted cellar
undercroft
bomarzo
part of the ruins
cave church
charcoal kiln
interior view
stone oven
the interior of the
burial chamber
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vaulted cellar
wall tunnel
basement
passageways
railway tunnel
corridor
subterranean
waggonway
culvert
mine shaft
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vaulted cellar
storerooms
internal
roman bath
charcoal kiln
burial chamber
stone oven
cannon oven
caldarium
undercroft