The Wieliczka Salt Mine in Poland is one of the oldest of it’s kind. You can now enter this amazing mine on Google Street View to see statues and a church. It produced table salt all the way back in the 13th century and continuously until 2007 when it closed (source).
We don’t have Google Street View throughout Greece yet, but this old monastery is now on Street View. The Monastery of St John the Theologian was founded in 1088.
This is at the Getty Center in LA. Note the new navigation feature in the upper left of the canvas (elevator buttons that actually work)