
Fountain by Marcel Duchamp: Voted the most influential artwork of the 20th century, Marcel Duchamp's upturned urinal changed the course of art - creating 'conceptual art'. (S3, ep 2)

Melencolia I, by Albrecht Durer: Created in 1514 and widely regarded as the greatest print ever made, Durer's Melencolia has defied all attempts to understand it. (S3, ep 1)

The Garden of Earthly Delights by Hieronymus Bosch: One of the world's most popular pictures, The Garden of Earthly Delights is also one of the most mysterious. (S3, ep 3)