It has one ruler who all the subjects serve.
The kingdom has numerous institutions setup by the subjects for the benefit of the ruler.
For some reason, the sewers of the kingdom are free of rats.
The ruler has a very few ministers who directly report to him.
There is no punishment for treason. At times the ruler provokes the subjects to attempt it.
The kingdom has efficient roads and developed vehicles.
It has a distinct automatic watering system which helps it grow grass.
Guess the kingdom and explain the hints.