Google does some amazing things. Street View, Body Browser and now Art Project.
Art Project is a kind of Street View within the walls of the major art museums. The ability to "walk" through the galleries is pretty limited, but that's hardly the best part of this. What is most amazing is the ability to zoom in on specific pieces of art. You can zoom so far in on some pieces you can see the texture of the canvas and every color detail of every brush stroke. But don't bother reading my description. Try it out for yourself!