"I miss my hometown far away" means that I still miss my hometown even though I am far away. No matter where you are, people's feelings and memories of their place of birth and growth will be deeply rooted in their hearts and often missed. "Miss the world in my hometown" means that even in my hometown, I will miss distant places and yearn for unknown places. This sentence reflects the human desire for the unknown and exploration. Even in a familiar environment, people will miss the distant horizon.
No matter where you are, people will miss their hometown, but at the same time they will yearn for unknown places.