Medieval structures include Farleigh Hungerford Castle , fortified around 1370 , and The George Inn at Norton St Philip , used as an army headquarters during the Monmouth Rebellion in 1685 , and then as a courtroom to try the rebels in the Bloody Assizes . Manor houses such as the 15th @-@ century Seymours Court Farmhouse at Beckington and The Old Manor at Croscombe . Mells Manor followed in the 16th century and in the 17th century Southill House in Cranmore was built . Ston Easton Park and Ammerdown House in Kilmersdon was both completed in the 18th century . The most recent buildings included in the list are churches : the Church of St Peter at Hornblotton , built in 1872 – 74 by Sir Thomas Graham Jackson to replace a medieval church on the same site , and Downside Abbey at Stratton @-@ on @-@ the @-@ Fosse , more formally known as " The Basilica of St Gregory the Great at Downside " , a Roman Catholic Benedictine monastery and the Senior House of the English Benedictine Congregation . The current buildings was started in the 19th century and are still unfinished .