Carn Brea Castle is a small stone folly decorated in the romantic ideal style of a medieval/gothic castle. It has an irregular layout with 4 rectangular turrets round a core of the same height and an embattled parapet. The building is built into a large stone outcrop with a steep drop on the rear.
The Basset Monument: At the highest point of the hill is a 90-feet high (27m) Celtic Cross erected as a monument to Francis Basset (1757–1835). Basset, a mine owner, gained his titles for erecting earthworks to defend Plymouth from combined French and Spanish fleets in 1779, and suppressing a miners’ “food riot” in 1785. Along with others, he petitioned the House of Lords against slavery in 1828. The monument was erected by public subscription in 1836. It is inscribed “The County of Cornwall to the memory of Francis Lord de Dunstanville and Basset A.D. 1836