What's on Heritage Open Days Tree Tours Get some fresh air and join one of our Cathedral Guides on this tour of the Cathedral grounds. Discover the history of some of the city’s oldest trees, how they were used and some royal connections on this family friendly trail. Please meet your guide inside South Transept of the Cathedral. The tour will be outdoors so please wear appropriate footwear. It will go ahead in light rain. Suitable for all ages This event is ticketed but admission is free. To view our full Heritage Open Days programme, please click here.