The British Isles
Country houses, walled gardens, coast.
- Grade II listed building
Old Manor Parrock Manor
Gravesham · South East England — United Kingdom
Old Manor Parrock Manor is a Grade II listed building in Gravesham, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.
- Château
Old Mountjoy
County Tyrone — United Kingdom
Old Mountjoy is a château at County Tyrone, Northern Ireland, in the United Kingdom. The recorded building campaign dates from the 18th century. The register records it as “Grade B+ listed building”. Details are drawn from Wikidata.
- Grade II listed building
Old Place Manor
Pulborough · South East England — United Kingdom
Old Place Manor is a Grade II listed building in Pulborough, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.

Old Ramerick Manor
Ickleford · East of England — United Kingdom
Old Ramerick Manor is a Grade II* listed building in Ickleford, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.
- Grade II listed building
Old Sharnden Manor
Mayfield and Five Ashes · South East England — United Kingdom
Old Sharnden Manor is a Grade II listed building in Mayfield and Five Ashes, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.

Old Shute House
Shute · South West England — United Kingdom
The surviving service range of a much larger Devon house, with medieval roof structures and a great kitchen that preserve only part of the former complex.
- Grade II listed building
Old Surrenden Manor
Bethersden · South East England — United Kingdom
Old Surrenden Manor is a Grade II listed building in Bethersden, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.
Old Wardour Castle
Tisbury · South West England — United Kingdom
The ruins of a fourteenth-century castle associated with the Arundell family, set beside a lake and distinguished by an unusual six-sided arrangement.

Oldway Mansion
Torbay · United Kingdom — United Kingdom
Oldway Mansion is a Grade II* listed building in Torbay, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.

Ollerenshaw Hall
Chapel-en-le-Frith · East Midlands — United Kingdom
Ollerenshaw Hall is a Grade II listed building in Chapel-en-le-Frith, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.
- Grade II listed building
Orchard Manor
Martin Hussingtree · West Midlands — United Kingdom
Orchard Manor is a Grade II listed building in Martin Hussingtree, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.

Orchards
Bramley · South East England — United Kingdom
Orchards is a Grade I listed building in Bramley, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.

Ordsall Hall
Salford · Salford — United Kingdom
A timber-framed historic house in Salford, with surviving medieval fabric and a Tudor Great Hall at the centre of its story.

Orford Castle
Orford — United Kingdom
Orford Castle is a château at Orford, England, in the United Kingdom. The recorded building campaign dates from the 12th century. The register records it as “Grade I listed building”. Details are drawn from Wikidata.

Orielton House
Hundleton — United Kingdom
Orielton House is a château at Hundleton, Wales, in the United Kingdom. The recorded building campaign dates from the 17th century. The register records it as “Grade II* listed building”. Details are drawn from Wikidata.
Orleigh Court
Buckland Brewer · South West England — United Kingdom
Orleigh Court is a Grade I listed building in Buckland Brewer, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.
- Grade II* listed building
Orleton Hall
Wrockwardine · West Midlands — United Kingdom
Orleton Hall is a Grade II* listed building in Wrockwardine, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.
- Grade II* listed building
Orleton Manor
Orleton · United Kingdom — United Kingdom
Orleton Manor is a Grade II* listed building in Orleton, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.

Ormesby Hall
Redcar and Cleveland — United Kingdom
Ormesby Hall is a château at Redcar and Cleveland, England, in the United Kingdom. The recorded building campaign dates from the 18th century. The register records it as “Grade I listed building”. Details are drawn from Wikidata.
- Grade II listed building
Ormesby Manor
Ormesby St Michael · East of England — United Kingdom
Ormesby Manor is a Grade II listed building in Ormesby St Michael, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.

Osborne House
East Cowes — United Kingdom
Osborne House is a château at East Cowes, England, in the United Kingdom. The recorded building campaign dates from the 19th century. Its architecture is recorded as Renaissance Revival architecture. The register records it as “Grade I listed building”. Details are drawn from Wikidata.
- Grade II listed building
Osmanthorpe Manor
Edingley · East Midlands — United Kingdom
Osmanthorpe Manor is a Grade II listed building in Edingley, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.
- Grade I listed building
Otley Hall
Otley · East of England — United Kingdom
Otley Hall is a Grade I listed building in Otley, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.
- Grade II listed building
Otterpool Manor
Lympne · South East England — United Kingdom
Otterpool Manor is a Grade II listed building in Lympne, England, United Kingdom. This concise register entry is based on Historic England’s National Heritage List for England.