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Historic home of the Cust and Brownlow families for over 300 years, Belton House was gifted to The National Trust in 1984 and is visited by over ¼ million people a year.
Arguably the finest late 17th century house in England, built for Sir John Brownlow 1685-89 by an unknown architect, sometimes attributed to Sir Christopher Wren, though most likely by Captain William Winde and much altered by James Wyatt in the late 18th century. A National Treasure.

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