Kaon is a city state on Cybertron, located in the southern hemisphere. It is the most stereotypical bad guy base
Autobots in Kaon by Homicide Crabs

The most Kaon is seen outside of the prison

ever ,as it always rains and thunders,(even though Cybertron has no clouds) everything is purple,most of it is a prison,and it is the capital decepticon city,with Iacon being the Autobot equal.


All that is known of Kaon is it large prison,but judging from the background outside,it's just a road with some buildings that look like purple glowing tampons. Odd choice of city styling, Megatron.