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sluice gate
penstocks
casemate
culvert
majdanek
downstream gate
outfalls
bunker
the water shed
two-stage lock
hangman's bridge
abandoned boat
culverts
canalisation
mine shaft
disused railway line
road bridge
gapstow bridge
waggonway
chapel bridge
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sluice gate
outfalls
downstream gate
the water shed
two-stage lock
footbridge
bunker
decommissioned
mine shaft
wekerle battery
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outfalls
disused railway line
revetments
megalith facility harhoog
emplacement
ditch side
limekiln
disused
goldstream
winding steps
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two-stage lock
longues-sur-mer battery
danube lock
batterie de longues
sluice gate
modlin fortress
fortifications
floodwalls
bargewell
military fort
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disused railway line
railway tunnel
lötschberg tunnel
train tunnel
abandoned train station
private railway
the selketal railway
old tracks
local railway
railway track
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casemate
penstocks
disused railway line
batterie de longues
mine shaft
bunker
railway tunnel
ditch side
souterrain
disused
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hudswell
sluice gate
muskerry
disused railway line
lobau
hilsea
ditch side
mining site
clearwell
the water shed
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sluice gate
downstream gate
footbridge
the water shed
powerstation
signalbox
gangways
bunker
transmitter
boat shed
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bunker
downstream gate
sluice gate
ditch side
archery stand
megalith facility harhoog
burial chamber
mausoleum ruins
impoundment
emplacement
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wekerle battery
the water shed
military fort
boat yard
bunker
charcoal kiln
loading dock
french military graveyard
sluice gate
precipitators
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danube lock
batterie de longues
observation tower
modlin fortress
sluice gate
turret
the source of the danube
observation deck
hydroelectric
the observation deck
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lubitel 2
railway bridge
old bridge
disused railway line
tsarskoe
hangman's bridge
knottingley
railroad bridge
viaduct
patricroft
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souterrain
tunneled
waterweg
lötschberg tunnel
underpasses
passageway
underpass
forat
tunnelled
sentier
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mine shaft
penstocks
underframe
railroad bridge
steel stairs
industrial ruin
abandoned train station
sewer
precipitator
mining facility
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tunneled
tunnelled
souterrain
railway tunnel
tunnels
tunnell
undermountain
hollow way
mine shaft
passageway
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old bridge
footbridge
hangman's bridge
hilsea
oxenbridge
revetments
hanging bridge
ancholme
viola bridge
sluice gate
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culvert
sluice gate
underpasses
underpass
thamesmead
majdanek
embankments
cistern
canalisation
underground car park
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disused railway line
ditch side
water channel
tributary
outfalls
canalisation
watercourse
schifferstadt
waggonway
anticlinal
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footbridge
adventure bridge
suspension bridge
hanging bridge
spans
road bridge
gapstow bridge
bridge - building structure
old bridge
rope bridge
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bruecke
footbridge
brug
railway bridge
sluice gate
memorial bridge
overbridges
chapel bridge
road bridge
hangman's bridge
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bridge piers
outfall
sluice gate
old pier
spans
arco humber
two-stage lock
duwamish
industrial tubes
under the bridge