Blenheim Palace (pronounced ) is a monumental country house situated in Woodstock, Oxfordshire, England. It is the principal residence of the dukes of Marlborough, and the only non-royal non-episcopal country house in England to hold the title of palace. The palace, one of England's largest houses, was built between 1705 and circa 1722. Blenheim Palace was designated a UNESCO World Heritage Site in 1987.