Ham Hill in Somerset - a country park and still partly a working quarry for the beautiful orange 'Ham stone' that typifies the local buildings - has a modern stone circle that's starting to weather quite nicely.
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It was erected as a millennium project and commemorates the long history of stone quarrying on the hill.
Back in the 1970s there were still concrete WWII pill boxes standing, from when the quarry was used for training. If you were lucky you could still find the odd brass bullet casing. From the war memorial in the background you can see many villages all around, including the late Paddy Ashdown's gaff.
Well worth a visit if you're in south Somerset, more stuff here:
https://www.historic-uk.com/HistoryMagazine/DestinationsUK/Ham-Hill-Somerset/