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A La Ronde is a grade I listed fanciful 16-sided house, built in 1796 for two eccentric spinster cousins, Jane and Mary Parminter. The ground floor rooms radiate from a central atrium called "the octagon" and the whole house is filled with objets d'art collected primarily from the cousins' European Tour 1784-86. It was acquired by The National Trust in 1991.

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