When I think about kingdoms I get images of knights and kings and wizards. For some you might think about our neighbor across the pond. Our earthly understanding of kingdom is geopolitical. It must be in a physical location and it must have some form of political power. The United Kingdom can be pinpointed to a specific geographical location. The kingdom of Arthur, though legend, can be characterized by a certain form of politics.
Yet if I asked you to point to the Kingdom of God, you could not find it on a map. If I said what are the politics of the Kingdom of Heaven you might be able to tell me about ideals, but not any treaties that the Kingdom of God has with North Korea. The Kingdom of God does not have a seat at the UN. It does not have a navy or an air force. No, the Kingdom of Heaven is something very different than all other kingdoms.
