France's south-western Périgord region comes in four colours: green, purple, black and white. First stop: the green Périgord and its bike rail to contemplate the richness of the meadows. Next comes a wine-tasting session in Bergerac in the purple Périgord, a region of orchards and vineyards. It's impossible to miss out on the black Périgord, where the famous prehistoric Lascaux cave is located. Our colourful trip ends in the white Périgord, where we discover Roman ruins.