Standing Buddha, ca. 3rd–4th century Pakistan (ancient region of Gandhara) at the Metropolitan Museum, assumed allowed under Fair Use.
Lady Playing the Veena
Lady Playing the Veena by Raja_Ravi_Varma (29 April 1848 – 2 October 1906), assumed allowed under Fair Use.
Colosseum and Arch of Constantine, Rome
Colosseum and Arch of Constantine, Rome by Giovanni Antonio Canal (18 October 1697 – 19 April 1768), AKA Canaletto, which is Italian for “Canaletto”, assumed allowed under Fair Use. This guy has a LOT of nice landscapes.
The Visitation By El Greco
“The Visitation” by El Greco (1541 – 7 April 1614), housed at Dumberton Oaks assumed allowed under Fair Use.
Self Portrait of Zinaida Serebriakova
Self portrait of Zinaida Serebriakova (1884-1967), assumed allowed under Fair Use.
Look at all the stocks I do not have
Image from 
Book Of Kells 291
Image number 291 from the Book of Kells, assumed allowed under Fair Use.
Landscape LACMA
Painting by Kim Hong-do (1745-1814), assumed allowed under Fair Use.
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Wall painting from Room H of the Villa of P. Fannius Synistor at Boscoreale
Wall painting from Room H of the Villa of P. Fannius Synistor at Boscoreale available at The Metropolitan Museum of Art, assumed allowed under Fair Use.
Crucible of Creation
“Crucible of Creation” taken by the Hubble Telescope and released by NASA on November 20th, 1995. Image from Hubble Site, assumed allowed under Fair Use.