This tour utilizes PTViewer a javaScript Applet.

Drag your mouse in the image above to navigate or use the arrow keys. Push the + or - keys to zoom in or out.
If you can’t see the movie, enable javascript or make sure you have the most recent java version http://www.oracle.com/.
This can be viewed with Google Chrome or Microsoft Edge browsers using the Cheerpj applet runner extension https://labs.leaningtech.com/docs/cheerpj-applet-runner/.