Lanhydrock is a large country mansion situated in extensive grounds (360 hectares or 890 acres) above the River Fowey.

Most of the current buildings date from late Victorian times. The second Lord Robartes (later the 6th Viscount Clifden) rebuilt the house to meet the needs of his large family, appointing local architect Richard Coad to design and supervise most of the work. Coad had previously (1857) worked as assistant to George Gilbert Scott on earlier work at Lanhydrock.

In 1953 the house and approximately 160 hectares (400 acres) of parkland were given to the National Trust by the 7th Viscount Clifden. The public tour is one of the longest of any National Trust house and takes in the service rooms, nurseries and some servants' bedrooms, as well as the main reception rooms and family bedrooms. In 2004 it was one of the Trust's ten most visited paid-entry properties, with over 200,000 visitors.