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military fort
old fort
moundville
battery spencer
cannonsburg
fortifications
the water shed
batterie de longues
mausoleum ruins
historic site
casemate
citadel hill
vicksburg
bunker
mine shaft
former prison
castle vineyard
crown engine houses
guardhouse
fortification
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military fort
old fort
moundville
battery spencer
fortifications
blockhouse
cannonsburg
batterie de longues
the water shed
reformatories
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doocot
louisbourg
wiarton
queenston
michilimackinac
observation tower
stone tower
castleisland
battlements
yorktown
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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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wekerle battery
former prison
mausoleum ruins
abandoned building
military fort
historical monument
pigeon house
cooling house
syringe house
dobnik
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burial mound
forest chapel
mausoleum ruins
burial chamber
part of the ruins
megalith facility harhoog
springhouse
mining site
mine shaft
kisatchie
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military fort
old fort
suomenlinna
moundville
citadel hill
yorktown
modlin fortress
vicksburg
fortifications
fort of santa catalina
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burial chamber
mausoleums
vaulted cellar
columbarium
cannon oven
stone gate
mausoleum ruins
stone oven
soldier's grave
crematorium
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reformatory
old fort
penitentiary
pentridge
maymont
moundbuilders
military fort
osawatomie
former prison
gaol
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wayside chapel
belltower
sewanee
bell tower
old mill
senneker
stone tower
lookout tower
accokeek
moundbuilders
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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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military fort
modlin fortress
old fort
fortifications
peter-pavel's fortress
mausoleum ruins
charcoal kiln
guardhouse
castle of hunedoara
antietam
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casemate
modlin fortress
limekiln
fortifications
batterie de longues
military fort
buchenwald
longues-sur-mer battery
wekerle battery
aigurande
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blockhouse
dovecote
lookout tower
old mill
dovecot
fire tower
water mill
watch tower
post mill
gristmills
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military fort
former prison
reformatory
penitentiary
floodwalls
floodwall
blockhouses
concentration camp
penitentiaries
buchenwald
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blockhouse
springhouse
wissahickon
ruhl house
wekerle battery
military fort
holthouse
the water shed
old fort
old mill
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pentridge
buchenwald
mauthausen
former prison
goliad
military fort
old fort
caravansary
fort of santa catalina
penitentiaries
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burial mound
douaumont
burial mounds
citadel hill
knowth
maeshowe
tumulus
ringfort
military fort
modlin fortress
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longues-sur-mer battery
douaumont
moundville
beaverbrook
amphitheater
cahokia
canajoharie
pottawattamie
amphitheatre
gethsemani
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covered bridge
springhouse
old mill
canajoharie
hangman's bridge
antietam
mill wheel
chapel bridge
old bridge
stone bridge
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maymont
newcastle castle
concarneau
citadel hill
peasholm park
merion
cohasset
drum castle
castle ruins
castle park