Learn more about the rare High Brown Fritillary and where to spot them in this informative trail for adults. Heddon Valley is home to some of the rarest butterflies in the country, including the High Brown Fritillary. If you want to know more, this informative trail will help you discover some of the best spots to see these beautiful butterflies and learn about. Booking Not Needed. Phone: 01598 763402... See more >