The 4,850 year old Le Couperon is a Neolithic dolmen in the parish of St Martin, Jersey. Le Couperon is around meters long capstone chamber that a long mound had originally covered. It was surrounded by a ring of 18 outer stones, known as peristaliths. The site was first excavated in 1868.
The guardhouse built in 1689 from local stone with brick lintels, this guardhouse was designed to house gunpowder and the militia gun crews who were stationed here to protect the coast from french invasions. Cannons were postioned in the Corps de Garde battery on the headland above.