Grimsthorpe Castle is a country house in Lincolnshire, England 4 miles (6.4 km) north-west of Bourne on the A151. It lies within a 3,000 acre (12 km²) park of rolling pastures, lakes, and woodland landscaped by Capability Brown. While Grimsthorpe is not a castle in the strict sense of the word, its character is massive and martial – the towers and outlying pavilions recalling the bastions of a great fortress in classical dress.