Castle Howard by Hawksmoor. The grounds of Castle Howard are also used as part of at least two charity running races during the year. Located on the Estate, but operating separately to the house and gardens and run by an entirely independent charitable trust, is the Yorkshire Arboretum. Originally created through the enthusiasm and partnership of George Howard (Lord Howard of Henderskelfe) and James Russell, over a period of eighteen years, from 1975 to 1992, it was opened to the public for the first time in 1999 and a new Visitor Centre opened in 2006.The arboretum's extensive and important collection of 6,000
English Bicknor Castle stage on the motte, and a church was built in the outer bailey. At the start of years of the Anarchy the castle was controlled by the powerful Miles de Gloucester. The castle escaped destruction at the end of the conflict and was still in use at the beginning of the 13th century, when it was owned by William Avenel; its exact date of final ruin is unknown. English Bicknor Castle English Bicknor Castle was a castle in the village of English Bicknor in Gloucestershire, England. The castle was built in the 11th century as a motte and bailey design,