Heritage Open Day: Enjoy free entry to National Trust Knightshayes and discover how history and nature influenced the architecture of the Victorian Gothic house, and what you can find in the gardens and parkland today. Visit National Trust Knightshayes for Heritage Open Days on 13 and 14 September. Enjoy free entry to the whole site, and discover the influences of architect William Burges for the design of the Victorian Gothic house. From nature to history, there are a wealth of influences throughout the house, and also discover what architectural features you can see in the gardens and parkland.