Mowbray Castle at Hackfall near Ripon is a Grade II listed mock ruin built between 1750 and 1767 for William Aislabie as an ornamental folly within his landscaped estate. This oval-shaped structure of ashlar and rubblestone features two to three storeys with a central offset bay and rubble wall remnants, exemplifying 18th-century Romantic taste for artificial ruins. The site became a celebrated visitor attraction by the 1780s, drawing approximately two hundred parties per season by 1801. A specialist restoration in 2007 reinstated its structural integrity, allowing contemporary visitors to experience this charming example of estate architecture and landscape design that shaped Regency-era aesthetics.
