Waldemar Januszczak examines Caravaggio's 16th-century artwork Boy Bitten by a Lizard, which exists in two versions and is shrouded in mystery.

Waldemar Januszczak examines the secrets hidden in Rembrandt's masterpiece The Anatomy Lesson of Dr Nicolaes Tulp, an oil painting from 1632.

Waldemar Januszczak uncovers the secret meanings hidden within more of the world's most famous paintings, beginning with German Renaissance artist Albrecht Dürer's large 1514 engraving Melencolia.