Knebworth House is one of England's most colourful stately homes. It is remarkable for having been in the Lytton family for more than 500 years. Its romantic gothic exterior complete with turrets, domes and gargoyles conceals a much older Tudor red brick house. This treasure hunt starts at the Front Door of the House, so please make your way around the House to the Courtyard. Install the free Huntzz app from the App Store or Google Play to follow this hunt.