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Wimpole Estate is a large estate containing Wimpole Hall, a country house located in Cambridgeshire, about 8 miles southwest of Cambridge. The house, begun in 1640, and its 3,000 acres of parkland and farmland are owned by the National Trust. The estate is regularly open to the public. Wimpole is the largest house in Cambridgeshire and a Grade I listed building. Link
Wikipedia: Link

A National Trust is an organization dedicated to preserving the cultural or environmental treasures of a particular geographic region. They generally operate as private non-profit organizations, although some receive considerable support from their national government. The first such organization was the National Trust for Places of Historic Interest or Natural Beauty, which is the National Trust of England, Wales and Northern Ireland, formed in 1895 and operating as a charitable organisation.

Extract from Wikipedia Link

List of National Trust places Link