The card is showing 18 parks and gardens:
Kenilworth Castle, Burghley House, Blickling Hall, Levens Hall, Powis Castle, Fountains Abbey, Holkam Hall
Duncombe Park, Rousham, Stourhead, Howard Castle, Tatton Park, Drummond Castle, Biddulph Grange
Great Dixter, Gibberd Garden, Little Sparta, Boughton House
The pictures are presenting also 500 years of garden history on British island. For the research about the current management and maintenance the tour included more as 80 places.