@Dave Allen,
I really would recommend the Megalithic European if you haven't yet read it, it's expensive but it's a huge full colour hardback that covers sites throughout Europe from Ireland to Greece.
Plus, the author wrote "World Shut your Mouth".
Megalithic European: The 21st Century Traveller in Prehistoric Europe: Amazon.co.uk: Julian Cope: Books
Julian Cope's long-awaited follow up to The Modern Antiquarian, his bestselling and critically acclaimed guide to ancient Britain. The Megalithic European takes us on a breathtaking journey around prehistoric Europe's first temples.
Contents
* The Megalithic European is a monumental colour guide to the standing stones and ancient temples of prehistoric Europe.
* In a 6-year personal odyssey (leaving no stone unturned) Julian Cope covers 300 of the important sites of Northern Europe and the Mediterranean.
* The book looks further, revealing several thousand years of information which scholars have previously ignored, to the Classical temples of the Eastern Mediterranean and Aegean Seas.
* Section 1: a series of essays, looking at the universal desire of all settlers: to celebrate and mythologize the landscape in which they have chosen to live, highlighting comparisons with British settlements.
* Section 2: a gazeteer of the many ancient sites in Europe that Julian Cope has personally visited, from Ireland to the Netherlands, from Crete to Denmark, discussing many areas outside the European arena, from Mount Ararat in Armenia to Mount Fuji in Japan, via the celebrated Mount Olympus of the Greek Myths to the legendary Tree of Yggdrasil of the Norse Myths.