Stéphane Guisard traveled to the Paranal observatory, situated in Chile's remote Atacama desert, in search of the "darkest sky." The result? Some amazing zoomable, fisheye images that reveal the darkest of dark skies (including a glimpse of the Gegenschein). And then also this "byproduct": a 360 degree panoramic view of the Milky Way that lies on the dark sky horizon. You can view Los Cielos de Chile here.
Please note that the page can take a little time to load. But once you're there, you can toggle around the images and control the views.