London, July 14 : Over 200 historic and tourism sites in Scotland are to open Wednesday as part of a rolling programme to allow visitors to attractions closed in March due to the Covid-19 pandemic. Historic Environment Scotland (HES), Scotland's biggest operator of visitor attractions, has announced it will provide access to over 200 unstaffed and key-keeper sites across Scotland where physical distancing can be maintained, Xinhua reported. With over 300 properties in its care, the HES is adopting a phased approach to reopen 70 per cent of its free to access and ticketed properties by mid-September. Edinburgh Castle, Stirling Castle and Urquhart Castle will reopen on August 1. Visitors will have to pre-book tickets online and to use contactless payment where possible, with one-way systems implemented in some locations, according to the HES. /IANS