It varies in Europe. Sweden and other Scancniavian countries care for their ancient sites very well. Guiding and signage is excellent. In France it varies and when the Portal's guy did his 6 months tour, he really had to do pionering work to find them. He is still working through 6,000 photos!
Germany and Holland are good and we are getting cracking material from all over.

We know that there is much in Spain and so many other places. The task is enormous and what I have learned is that there was something like a pan-megalithic culture from Britain and Scandinavia right across northern Europe into Russia, Mongolia and beyond. Similarly, megaliths sweep down through France into Iberia and many Mediterranean islands. We are just beginning to locate them. Go to the Portal and look at the Megalithic Map for parts of Europe - it is thick with sites and we have only just started.