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
Charleville Castle William Peters, which having been removed from the house in 1970 is now in a Canadian collection. The castle remained uninhabited from 1912 when Colonel Howard Bury left to live in Belvedere House, County Westmeath. By 1968 the roof had been removed. Work on its restoration was commenced by Michael McMullen in 1971 and later by Constance Heavey Seaquist and Bonnie Vance. A Charitable Trust has been formed to help with the restoration. Currently, the Charleville Castle Heritage Trust is managed by Dudley Stewart, with the day-to-day running handled by volunteers. The castle has been host to multiple events, including