Grade II listed Honeywood House in Sutton is awarded £335,000
Seven historic sites and projects have been awarded grants worth a total of £4.4m by the Heritage Lottery Fund.
Among the beneficiaries are a windmill in Brixton, a church organ in Wimbledon and a hidden castle in Greenwich.
As well as preserving and enhancing these heritage sites, the grants will also create 17 full-time jobs, two apprenticeships and 250 volunteer posts.
Wesley Kerr, Chairman of the Heritage Lottery Fund Committee for London said:
"This astonishing array of places and projects reminds us that every London borough is steeped in history. These awards will make that history more accessible to millions of people by broadening horizons and opening opportunities.
"We are thrilled to support these projects which demonstrate how central heritage is to London's economy and spirit in all its wonderful immensity."
The seven wonders
The following projects have all received grants from the Heritage Lottery Fund.
Sir John Soane's Museum, £813,000 grant
The Library Dining Room at Sir John Soane's Museum
This grant will help the Sir John Soane's Museum restore and open private apartments to the public for the first time since 1837.
The museum includes a huge collection of artefacts collected by Sir John Soane from all over the world, including a royal sarcophagus from ancient Egypt, paintings by Hogarth, and over a hundred architectural models.
Tim Knox, Director of Sir John Soane's Museum said: "The project enables us to deliver far more to the public - Soane's Private Apartment and his Model Room, and a new, larger exhibition Gallery."
Brixton Windmill, just under £400,000
Brixton Windmill was built in 1816
This unusual Grade II-listed building was built in 1816 and is one of the few remaining windmills in London.
The restoration will open up the interior of the windmill to the public.
A programme of educational activities will be organised and an audio-visual presentation on the ground floor will show the mechanical parts of the mill in operation.
New community activities are planned and 50 volunteers will be recruited from the local area.
Dream to Change the World, £206,000
This is an ambitious project to open up the archives of John La Rose (1927-2006) the founding chairman of the George Padmore Institute.
For several decades La Rose was an important figure in black British and Caribbean political and cultural activism.
A five year project will make his archive of more than 1300 files and 460 books available online for research.
Forty Hall, Enfield, £1.8 million
Forty Hall in Enfield
Forty Hall is a Grade I-listed 17th century mansion built for Sir Nicholas Rainton, a Lord Mayor of London and successful merchant.
The project will restore the property and create a visitor development programme with educational opportunities.
Honeywood House, Sutton, £335,000
Honeywood House has collection of over 6,000 items
This Grade II-listed 17th century building is Sutton's principal museum. It houses a collection of some 6,000 items that represent a history of local communities.
The money will go towards a minor restoration and repair to the property, a complete overhaul of the way in which artefacts are displayed and a varied education programme.
Severndroog Castle, Greenwich, £595,500
Shooters Hill landmark Severndroog Castle
Built in 1784, this Grade II-listed triangular castle commemorates a long-forgotten British naval victory against pirates in the Indian Ocean.
It has been closed to the public for 20 years, but this grant will restore it as a visitor attraction, educational centre and a tearoom.
Once the restoration is complete local volunteers will be trained to act as guides and run the day-to-day management and operation of the site.
Historic Walker Organ, £237,000
The Roman Catholic Church of the Sacred Heart on Wimbledon Hill contains an historic organ built in 1912 by JW Walker & Sons.
It is the only notable survivor among the larger Walker-built organs of this period and continues to be used for weekly services and classes for music students.
The organ will now be fully restored and two organ restoration apprenticeships created.