Caligula’s Palace and Bridge, Joseph Mallord William Turner
On Google Art Project. High-res downloadable file on Wikimedia Commons. Original is in the Tate Britain.
It’s paintings like this that earned Turner the appellation “Painter of Light”.
Link: Caligula's Palace and Bridge, Google Art project
The softness of the light gives the works such an ethereal look. I’d say the appellation was more than deserved.