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casemate
pillbox
batterie de longues
longues-sur-mer battery
exposed concrete
vaulted cellar
majdanek
underpass
underground garage
burial chamber
concrete ceiling
docomomo
underground car park
holekamp
concrete
concrete construction
djerassi
battery spencer
concrete pipe
remota
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bunker
underpasses
exposed concrete
longues-sur-mer battery
underpass
batterie de longues
concrete ceiling
undercroft
pillboxes
underground garage
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inside courtyard
underpasses
aviaries
sluice gate
habitat 67
the water shed
granaries
ditch side
vestibules
dachau
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bunker
batterie de longues
military fort
aviaries
pillboxes
hydropower plant
substation
mausoleum ruins
burial chamber
kennels
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casemate
batterie de longues
longues-sur-mer battery
military fort
pillbox
penstocks
fallout shelter
the water shed
wekerle battery
pillboxes
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canalisation
underpasses
infrastructures
souterrain
vollenhoven
infrastucture
streambank
bruecke
schifferstadt
sluice gate
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lötschberg tunnel
railway tunnel
underpasses
longues-sur-mer battery
casemate
undercroft
train tunnel
shotcrete
bunker
the limestone cave entrance
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bunker
mausoleum ruins
military fort
battery spencer
pillboxes
the water shed
wekerle battery
batterie de longues
hydropower plant
charcoal kiln
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casemate
batterie de longues
vaulted cellar
bunker
wekerle battery
the water shed
burial chamber
culvert
souterrain
limestone wall
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underpasses
bennettsbridge
road bridge
underpass
highway bridge
overbridges
viaducts
overbridge
kaiapoi
railway bridge
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the water shed
outhouse
outhouses
water well
ditch side
charcoal kiln
a chicken coop
vaulted cellar
farm gate
dobnik
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bunker
the water shed
battery spencer
casemate
mausoleum ruins
kennel
burial chamber
vaulted cellar
wekerle battery
vestibules
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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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casemate
the water shed
penstocks
fortifications
limestone wall
old wall
military fort
floodwalls
ditch side
mud wall
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ny sewer
the water shed
water channel
waste water system
water basin
sewer pipes
pigeon spring
water spring
mine shaft
drainage pipes
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mine shaft
vaulted cellar
batterie de longues
bunker
culvert
megalith facility harhoog
burial chamber
charcoal kiln
limekiln
rockshelter
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longues-sur-mer battery
floodwalls
hydropower plant
batterie de longues
douaumont
falaise
bunker
grain storage
cooling tower
lanark
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concrete blocks
corregidor
bunker
concrete construction
cement block
underpasses
concrete slabs
crematorium
exposed concrete
two-stage lock
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disused railway line
pillboxes
abandoned train station
longues-sur-mer battery
sluice gate
industrial ruin
military fort
old fort
the water shed
falaise
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hydropower plant
penstocks
hydroelectric
shotcrete
sewage treatment plant
wekerle battery
grain storage
batterie de longues
military fort
the water shed
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kifissia
callimachi
multi-story structure
syringe house
kalorama
cantilevered
observation tower
technion
habitat 67
palo alto