A well-kept garden surrounding the Syon House, which belongs to the Duke of Northumberland. When the House is open, you can visit the magnificent State and Private Apartments.
The area was previously the site of Sion Abbey, which was founded in 1415 and named after Mount Zion in Jerusalem. Its grounds were discovered in 2003. The park also contains lakes and the gardens boast a collection of ancient trees and plants. The Great Conservatory was designed by Charles Fowler in the 19th century.