On Blisland Manor Common is the prehistoric stone circle known as the Trippet stones; and on Hawkstor Down a henge monument the Stripple stones. Blisland Manor House is 16th century with later alterations; Lavethan House mid-17th century; and the house at Trewardale 1773, enlarged 1839. Lavethan house (1653) incorporates parts of the 15th century. The archway was brought from another site. Early clapper bridges at Bradford and Poleys Bridge (on the River Camel) built of granite in 1839 are also noteworthy. Blisland Manor was in the hands of the family of Billing for many years: they were also landowners at St Breward and elsewhere.