Matt 3:1-2 In those days John the Baptist came preaching in the wilderness of Judea, and saying, "Repent, for the kingdom of heaven is at hand!" NKJV
Just as the church is not the building, but the people (who are the Body of Christ), the kingdom is not a place as much as a state of relationship. We can be in His kingdom and at the same time be in horrible places, but we cannot be in His kingdom if He is not in us.