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vaulted cellar
casemate
culvert
cistern
pillbox
mine shaft
cisterns
the water shed
burial chamber
charcoal kiln
maeshowe
internal
sluice gate
vault
vaults
frigidarium
longues-sur-mer battery
penstocks
abutment
embrasure
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GIF 动图
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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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vaulted cellar
maeshowe
creepy doorway
basement
assay office in bannack
storerooms
cubbyhole
basements
bannack assay office
casemate
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burial chamber
maeshowe
passageways
passageway
vaulted cellar
outfalls
souterrain
megalith facility harhoog
tunneled
the limestone cave entrance
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charcoal kiln
vaulted cellar
wattle and daub
storerooms
pillboxes
fallout shelter
burial chamber
stone oven
columbarium
maeshowe
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vaulted cellar
storerooms
internal
roman bath
charcoal kiln
burial chamber
stone oven
cannon oven
caldarium
undercroft
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vaulted cellar
narrowness
underpin
underpinning
stairways
passageways
basements
stone stairs
passageway
stone stairway
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vaulted cellar
vestibules
mine shaft
undercroft
portcullis
doorway
burial chamber
kinneil
internal
wall tunnel
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amphipolis
serapeum
vaulted cellar
burial chamber
stone oven
empty tomb
storerooms
mithraeum
cannon oven
hypocaust
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vaulted cellar
mine shaft
herculaneum
cement block
water well
burial chamber
emplacement
empty tomb
pillboxes
the water shed
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the limestone cave entrance
burial chamber
mine shaft
vestibules
vaulted cellar
casemate
the water shed
creepy doorway
megalith facility harhoog
storerooms
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vaulted cellar
mine shaft
charcoal kiln
the water shed
the interior of the
mill wheel
culvert
salt mill
tunnelling
vaulted ceiling
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sluice gate
two-stage lock
downstream gate
canalisation
sea trenches
outfalls
water channel
floodwalls
the water shed
outfall
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casemate
mine shaft
vaulted cellar
pillboxes
storerooms
batterie de longues
burial chamber
wekerle battery
battery spencer
basement
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cistern
cisterns
pigeon spring
roman bath
the water shed
water spring
water basin
canalisation
sluice gate
water channel
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passageways
eastern state penitentiary
passageway
serapeum
douaumont
vaulted cellar
souterrain
tunneled
wall tunnel
casemates
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vaulted cellar
souterrain
limekiln
the water shed
acequia
undergrounds
clearwell
undercroft
passageways
subterranean
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casemate
bunker
vaulted cellar
burial chamber
charcoal kiln
the water shed
batterie de longues
mine shaft
wekerle battery
vestibules
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mine shaft
the limestone cave entrance
torii tunnel
charcoal kiln
vaulted cellar
takachiho
burial chamber
railway tunnel
corregidor
passageway
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undergrounds
vaulted cellar
tunneled
ny sewer
the water shed
subterranean
railway tunnel
undercroft
water channel
mine shaft
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water trough
serapeum
burial chamber
mikveh
vaulted cellar
obelisk tomb
roman bath
empty tomb
water basin
washbasin