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burial chamber
vaulted cellar
pillbox
cistern
passageway
passageways
culverts
cisterns
torii tunnel
penstocks
maeshowe
outfalls
the limestone cave entrance
souterrain
mine shaft
megalith facility harhoog
stone gate
tunnel
mausoleum ruins
sluice gate
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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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cave on the water
the limestone cave entrance
aqueduct
cerveteri
water spring
pigeon spring
water channel
crescent spring
the source of the danube
source de la sorgue
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vaulted cellar
souterrain
limekiln
the water shed
acequia
undergrounds
clearwell
undercroft
passageways
subterranean
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tunnel of plants
culvert
plant tunnel
wall tunnel
archway
vaulted cellar
limestone arch
round arch
hollow way
holloways
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waggonway
vaulted cellar
passageways
passageway
wall tunnel
limekilns
culvert
kinneil
tunneled
entry path
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the limestone cave entrance
stone stairway
souterrain
passageways
knowth
grotta
catacombs
passageway
cellar
stone stairs
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water spring
burial chamber
the limestone cave entrance
pigeon spring
temazcal
yaxchilan
stone oven
the water shed
charcoal kiln
vaulted cellar
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vaulted cellar
stone oven
charcoal kiln
grotto
casemate
stone gate
mine shaft
old window
celler
pigeon spring
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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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ringfort
drystone
burial chamber
limekiln
douaumont
maeshowe
passageways
waggonway
stone gate
iron age hut
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ditch side
microhabitat
water channel
the brook
pigeon spring
tributary
water trough
water spring
levada
crescent spring
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passageway
stone stairway
passageways
hollow way
railway tunnel
subterranean
maeshowe
corridor
winding steps
stairway
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storehouses
mill wheel
storerooms
mine shaft
vaulted cellar
the water shed
burial chamber
wattle and daub
doorway
kinneil
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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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vaulted cellar
steps carved in the rock
roccaforte
portcullis
stone stairs
pigeon spring
two-stage lock
mine shaft
penstocks
mill wheel
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the limestone cave entrance
burial chamber
subterranean
cave church
stone stairway
torii tunnel
cueva
vaulted cellar
gruta
mine shaft
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tunnel
vaulted cellar
wall tunnel
railway tunnel
tunnels
grotto
casemate
tunnel of plants
souterrain
pillbox
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passageway
the limestone cave entrance
passageways
wall tunnel
bomarzo
culvert
archway
vaulted cellar
souterrain
archways
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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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springhouse
old window
stone gate
culvert
vaulted cellar
grotto
casemate
limestone arch
sett
holloways