Paul says he would inherit the entire world, not merely a little plot of land between Egypt and Syria. This is what God is after in the Messiah: All people and the entire Earth.
But this is not a story of Jesus being taken many places. This is a story of Jesus remaining in one place and deepening in His love of the Spirit and the Father.
The main point Paul has been getting at in Romans is what God has done in the One man Jesus the Messiah—the rightful heir of God’s earthly kingdom—is far, far more than simply putting the human race back where it was before the intrusion of sin.
The coming of Jesus the Son was the fulfillment of all the Old Testament promises and prophesies, types and covenants. His resurrection and, as Peter asserts here, His transfiguration proved it.