In this previous post I was sharing this amazing 26 gigapixel image of Paris as well as a zoom into it.
You can create you own very large pictures and navigate through them easily now.
First: Create your own stitched picture (panorama or just large sum of xMP photos. For this the most scalable and easy to use to I’ve found is Image Composite Editor (ICE) from Microsoft research. You can download it for free there.
Finally, create a view in www.zoom.it (also a free service from Microsoft research) by pointing to this file.
For instance here is an example of a stich of the inside of Capitol’s dome in DC: