The Mystery of the Millom Lines - Britain’s lost Stonehenge?

Is Stonehenge a lone oddity? Short answer: NO.
Although much remains from the Neolithic period, excavations and surveys often reveal extensive damage to surviving sites, and, for the most part, their intended design and experience have been lost to time.
Key sources:
Clare, T. et al. (2007) The Prehistoric Monuments of the Lake District
Dickinson, S., (2021) Between the Mountains and the Sea, a new monument complex on the Cumbrian coast