Clic on "Play". Once in the gallery, wait 6 seconds for  the  automatic Guided Tour to start.
During Tour >>
- to switch to manual mode : click on screen
 - move : click on circles on ground, or "clic & drag" on screen
- zoom : mouse wheel
Full-screen version available on this link
After the visit, close the new tab created on your internet browser, to return to this site.