Snettisham Great Torc, Celtic Britons, 1st century BC, Snettisham (Norfolk) ?

La Venus del espejo, Velázquez, 1640, National Gallery ?

Penicillin, Alexander Fleming, 1928, St. Mary’s Hospital ?

Mariana, Millais, 1851, Tate Britain ?

The Sign of the Four, Conan Doyle, 1890, London ?

Yesterday, the Beatles, 1965, Abbey Road ?