Heritage Open Day: Seaton Delaval Hall may have been one of architect Sir John Vanbrugh’s smallest country houses; but it was home to the larger than life Delaval family. Discover more and visit the Hall for free as part of Heritage Open Day. Visit the Central Hall, Basement, West Wing, gardens & grounds. Join a 30-minute Potted History Talk with one of our knowledgeable guides and discover more about the hall and its past. You can also join our gardening team for a tour to see what’s in bloom and find out how the team care for the landscape and gardens surrounding the Hall.