Somewhat; Tim Traveler recently visited a 5,000-year-old dolmen in France, and it's preserved, but treated like any other small roadside attraction https://www.youtube.com/watch?v=1S6wP8ox1R4
I can't really watch the video but a dolmen in France is just a small roadside attraction, there are so many and they are usually on private property, you can't build a museum and visitors center around every single dolmen.
