Dionysus Mosaic, Römisch-Germanisches Museum, Cologne, Germany

This mosaic was uncovered in 1941, largely intact, and it was so big and so stunning that it was left where it was found and the museum was built around it.  The museum is designed in such a way that you do not have to go into it in order to see the mosaic.  You can peer in through a large glass window about one story above.  The view takes in the scope of the floor, but lacks the detail that can be seen close up.
Dionysus is in the center mosaic, but the various scenes depicted include satyrs playing instruments and maenads dancing.  The level of detail in each scene is not well captured in this picture but is breathtaking to see.  The floor dates to about 200 CE, which is around the time of Hadrian.  His personal villa in Tivoli is replete with mosaic floors, and the skill of the artisans of the time is magnificent.  I think the Romans would applaud the recent surge in valuing hand made items, as they were builders on an almost unimaginable scale.