Loire Valley in France

S1, E2: The former hunting lodge of Beauregard houses an astonishing portrait gallery. Straddling the river Cher, Chenonceau is also known as the "Castle of Ladies", in reference to its successive female residents - Diane de Poitiers and Catherine de Médicis. The Garden of Love and Garden of Music enchant visitors at Villandry. And finally, Brézé houses Europe's largest underground fortress.