The very attractive village of Beynac is spread along the northern bank of the Dordogne river, and then winds up the hill to the chateau perched above. The narrow lanes winding up through the traditional Dordogne honey-coloured buildings are lovely (and steep) - the main 'street' up the hill is the basket-makers path (Carnival del Panieraires).
The highlight of Beynac is the castle set on top of a high cliff on a bend in the Dordogne River, and high above much of the little village of Beynac itself. The village as a whole is unmissable if you are in the Dordogne region, I believe it is one of the most impreeive sights in France, it's current tranquility standing in stark contrast to the turbulent battles it has known in the past.
Beynac Chateau was a French stronghold, while the English had to make do with the equally magnificent Chateau de Castelnaud on the other side of the river. The castle has a suitably colourful history, dating from the Hundred Years War and the Albigensian Crusade, and is a very interesting chateau to visit.
Even if you have no interest in the magnificent views across miles of beautiful countryside you will surely want to stand in the same spot as Richard the Lionheart, and admire the surrounding scenery!
There is also an interesting 'archaeology park' in Beynac, where typical neolithic buildings have been constructed.
Find time as well to visit neighbouring Cazenac, to see its little church and yet more magnificent views.