From the 11-14 September English Heritage is allowing free admission to many of its properties. This year there are several local venues that I'll suggest to my brother that we go and visit.
Conisbrough Castle
The Mansion House, Doncaster
The gardens at Brodsworth Hall
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I picked up a leaflet from the library about the heritage open days last week..it is a good thing
Hopefully September's weather will be kinder to us too making the visits even more enjoyable.