It is called Mow Cop Castle, but it was built as a summerhouse in 1754. We’ve seen it as a part of our road trip to the White Peak. This time of the year it looks stunning with the purple flowers and the views are beautiful. Here is a detailed history of the castle, if you want to have a look.
The castle is part of National Trust, but there aren’t any visitor centers there. The car park is pretty small too and it’s limited to 2 hours.