The Standing Stones of CarnacStuart Taylor
The Carnac area is world famous for it's archeology and Camping Les Menhirs [a menhir is a standing stone] is an ideal base,  what is less well known is how accessible the various standing stones and dolmens are on foot or by bicycle. Just north of the pretty holiday town can be found the main alignments, hundreds of stones can be seen and although fenced to protect the stones and surrounding habitat there are days when tours can be arranged the details for which can be found at the visitor centre. Frankly there are too many stones and tombs to mention but the ones that I enjoyed the most were the alignments at Carnac themselves. A good circular walk around these stones should also include a visit to a privately owned tumuls to the south east of the 'de Kermario' stones, follow the track you'll find this interesting structure and be able to go inside a 6000 year old tomb for 1 euro and visit the restaurant that guards the tomb to discuss and speculate over what you've seen over a breton cidre.
You should also visit the fallen stone and dolmen at Locmariaquer and although it's not cheap to visit the museum it's worth it to learn more about how these structures were built and why they were felled. If you visit be sure to ask how to get to the tomb on the nearby beach and make sure you take a torch. There's not charge to go into the tomb [other the a bruised forehead -be warned] and you'll be amazed to spot stones that were carved 4000 BC. If you've got the bug by now make sure you get your 'Pass des Megalithes' stamped at each paid site it'll save you money. Not far from the centre of Carnac is the museum dedicated to prehistory, well worth a visit and I found it best to visit in the middle of the trip to put everything in a bit of context.
Get your boots on now and head for Erdeven north of Carnac on the D781 park up and see how history can be completely obliterated by progress [the line of stones seems to have got in the way of the road]. From here there is a 9.5km circular walk which takes in various megaliths and dolmens including the Crucuno dolmen with a 60 tone roof ! How did they do that ?
There are loads and loads and loads of stones and tombs to explore and I'd recommend getting hold of 'Walks in Morbihan' by G H Randall not only are the walks easily followed but the author gives step by step instructions on how to get to hidden treasures that send a tingle up your spine when you try to visualise the incredible effort that these primitive people must have gone to install these structures which I think are actually older than the pyramids.