To look after Places of Historic Interest or Natural Beauty permanently for the benefit of the nation across England, Wales and Northern Ireland.
The trust owns 200 historic houses that are open to the public. The majority of them are country houses, and most of the others are associated with famous individuals. The majority of these country houses contain collections of pictures, furniture, books, metalwork, ceramics and textiles that have remained in their historic context. Most of the houses also have important gardens attached to them, and the trust owns some important gardens not attached to a house.