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
Howard County, Maryland initiated. With the closure of Haysfield Airport, there is one privately owned airstrip, Glenair Airport in Glenelg. Commercial air service is provided by Baltimore–Washington International Thurgood Marshall Airport, Ronald Reagan Washington National Airport, and Washington Dulles International Airport. Bus routes that operate in Howard County are managed by the Regional Transportation Agency of Central Maryland and the Maryland Transit Administration. Howard County has no incorporated municipalities. The Census Bureau recognizes the following Census-designated places in the county: Unincorporated places not listed as Census-designated places but known in the area include: Howard County, Maryland Howard County is a county in the