Alphabetical Index (O)

Oast
OASTHOUSE
OBELISK
OBSERVATION POST
OBSERVATION TOWER
OBSERVATORY
OCCUPATION LAYER
OCCUPATION SITE
OCCUPATIONAL THERAPY UNIT
OCEAN LINER TERMINAL
Oceanographic Research Station
OCHRE MILL
OCHRE MINE
OCHRE PIT
Ochre Works
OCTAGONAL KILN
OCTAGONAL TEMPLE
ODDFELLOWS HALL
Oddfellows House
Off Licence
Offertorium
OFFICE
OFFICERS MESS
OFFICERS QUARTERS
OFFICIAL RESIDENCE
OGHAM STONE
OHEL
OIL DISTILLERY
OIL ENGINE
OIL FIRED POWER STATION
OIL FUEL BERTH
OIL MILL
OIL PUMP
OIL REFINERY
OIL RETORT HOUSE
OIL RIG
OIL SILO
OIL WELL
OIL WORKS
OILCLOTH MILL
Old Aged Pensioners Club
Old Peoples Asylum
Old Peoples Home
OLYMPIC VLLAGE
Omnibus Depot
Omnibus Station
ONION DRYING SHED
OPEN AIR SCHOOL
Open Air Swimming Pool
OPEN AIR THEATRE
OPEN AIR WARD BLOCK
OPEN BRETHREN MEETING HOUSE
Open Cast Coal Workings
Open Cast Copper Workings
Open Cast Iron Workings
OPEN CAST MINE
Open Cast Tin Workings
Open Cast Workings
Open Conduit
OPEN FIELD
OPEN HALL HOUSE
OPEN HEARTH FURNACE
Open Pit Mining
Open Prison
OPEN ROPEWALK
Open Settlement
OPEN SITE
OPEN TRAINING PRISON
Open Work
Opencast Lead Workings
OPENCUT
OPERA HOUSE
OPERATING THEATRE
Operating Theatre Block
OPERATIONAL READINESS PLATFORM
OPERATIONS BLOCK
OPERATIONS ROOM
Opercula
Ophthalmic Department
Ophthalmic Hospital
OPPIDUM
OPTICIANS
ORANGERY
Oratory
ORCHARD
ORCHARD HOUSE
ORDNANCE DEPOT
ORDNANCE DISPOSAL SITE
ORDNANCE FACTORY
Ordnance Office
ORDNANCE STORE
ORDNANCE STOREKEEPERS HOUSE
Ordnance Survey Office
ORDNANCE YARD
Ore Bin
ORE CHUTE
Ore Crushing Mill
ORE HEARTH
Ore Pass
Ore Shute
ORE STORE
ORE WASHING PLANT
ORE WORKS
ORGAN FACTORY
ORIENTAL INSTITUTE
Oriental Orthodox Church
Oriental Strangers Home
Orillon
ORLIT HUT
ORLIT POST
ORNAMENTAL BATH
ORNAMENTAL BRIDGE
ORNAMENTAL CANAL
ORNAMENTAL CLEARING
ORNAMENTAL CLOCK
Ornamental Dairy
ORNAMENTAL FOUNTAIN
ORNAMENTAL GARDEN
ORNAMENTAL LAKE
ORNAMENTAL POND
Ornamental Terrace
Orphan Asylum
Orphan Houses
ORPHAN SCHOOL
ORPHANAGE
Orphanage Chapel
Orphanage School
ORTHODONTICS DEPARTMENT
ORTHODOX CHURCH
ORTHOPAEDIC DEPARTMENT
ORTHOPAEDIC HOSPITAL
Orthostat
OSIER BED
OSSUARY
OUBLIETTE
OUTBUILDING
OUTDOOR PLAYHOUSE
OUTDOOR SWIMMING POOL
Outer Bailey
OUTFALL SEWER
OUTFARM
OUTFITTER
OUTPATIENTS DEPARTMENT
OVAL BARROW
OVAL ENCLOSURE
OVEN
OVERBRIDGE
Overflow Weir
Overhead Cableway
OVERHEAD CRANE
Overlookers House
Overseers House
Overshot Waterwheel
OVERSHOT WHEEL
OX BOW STONE
OX ENGINE HOUSE
Ox House
OXHOUSE
OXLAND WORKS
OYSTER BEDS