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fortifications
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castle wall
modlin fortress
kinneil
cromford
former prison
limekilns
lanark
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longues-sur-mer battery
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fortifications
floodwalls
casemate
penstocks
military fort
longues-sur-mer battery
modlin fortress
city walls
old fort
aileach
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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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waggonway
innisfallen
bunratty
clontibret
ditch side
tregaron
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kilfedder
quay wall
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mill wheel
penstocks
remagen
water wheel
longues-sur-mer battery
sawmills
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millstones
megalith facility harhoog
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disused railway line
part of the ruins
mausoleum ruins
jewish cemetery
ditch side
train cemetery
waggonway
the ruins of the palace
the water shed
abandoned train station
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limekiln
vaulted cellar
the water shed
ringfort
storerooms
portcullis
kinneil
stone gate
kennels
gatehouses
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roscrea
grangegorman
castlemartyr
kinneil
ballymaloe
aileach
clonfert
brehon
wewelsburg
monbazillac castle
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penygraig
nantyglo
sirhowy
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llangefni
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ceiriog
pontardawe
llwynypia
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aqueducts
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embankments
water channel
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penstocks
aqueduct
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eastern state penitentiary
fougeres
fougere
abbaye de belloc
morlaix
abbaye de sénanque
abbaye
michel brittany monastery
inside courtyard
oradour sur glane
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mausoleum ruins
part of the ruins
castle wall
the water shed
ditch side
military fort
pillboxes
galician castle
jewish cemetery
tadelakt wall
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pont saint-bénézet
tardebigge
gapstow bridge
chapel bridge
lubitel 2
wallbridge
innisfallen
muskerry
pensford
old bridge
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fortifications
military fort
casemate
city walls
old fort
castle wall
galician castle
monteforte
gatehouses
muralla
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wall tunnel
waggonway
longwall
old wall
aqueducts
aqueduct
fortifications
disused railway line
stonewalls
modlin fortress
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eastern state penitentiary
fougeres
fougere
abbaye de belloc
morlaix
abbaye de sénanque
abbaye
michel brittany monastery
inside courtyard
oradour sur glane
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fortifications
forteresse
city walls
heidelberger schloss
old fort
castle sponeck
military fort
city wall
fortezza
castilians
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casemate
vaulted cellar
limekilns
wall tunnel
tunnel
waggonway
clonfert
vaults
embrasure
fortification
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oradour
monbazillac castle
oradour sur glane
perigord
quercy
provins
apremont
longues
fougeres
abbaye de belloc
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railway tunnel
vaulted cellar
casemate
longues-sur-mer battery
wall tunnel
train tunnel
aqueduct
charcoal kiln
fortifications
military fort
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tixall gateway
viaducts
old bridge
gapstow bridge
hangman's bridge
clatterbridge
kinneil
wansbrough
stone bridge
viaduct