In this three-part series, art historian Andrew Graham-Dixon goes on the road to reveal the art treasures of Spain.

The second episode follows Andrew as he journeys to Spain s centre to explore the art of the 16th and 17th centuries.

From El Greco to Velazquez, this era was so extraordinary it became known as the Golden Age. But there was darkness beneath the glittering surface. Travelling from Toledo to Madrid, Andrew traces the rise and fall of the Spanish Empire, the brutal conquest of the New World and the religious madness of the Inquisition, and asks how some of the world s most beautiful art came out of such a violent period.