Artists throughout history have had their go-to muses: Dante Gabriel Rossetti had Elizabeth Siddal, Salvador Dalí had Gala Diakonova, Francis Bacon had George Dyer, and Frida Kahlo had Diego Rivera.

After the death of Spanish artist Francisco Goya in 1828, a series of 14 murals were found painted on the walls of his home near Madrid. They were all incredibly strange and unsettling ...