You can use the following voice commands to explore the image:
Click anywhere to enable voice control and fire up the Esper machine.
Use Google Chrome as this uses the Web Speech API, and it is the only browser to fully support it (as of January 2018)
https://commons.wikimedia.org/wiki/File:Johannesburg%27s_inner_city.jpg. This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.