Blenheim Palace is a country house in Woodstock, Oxfordshire, England. It is the seat of the Dukes of Marlborough. Originally called Blenheim Castle, it has been known as Blenheim Palace since the 19th century. One of England’s largest houses, it was built between 1705 and 1722, and designated a UNESCO World Heritage Site in 1987.
 
Interesting facts...
King Henry II built a secret retreat for his mistress, Rosamund Clifford, which could only be reached through a labyrinth. Today, only Rosamund’s Well remains as a reminder of this hidden love story.
Each year, Blenheim Palace must present a replica of the captured French standard to the monarch at Windsor Castle. If this tradition lapses, the palace could revert to the Crown!