The song 'I Can Only Imagine' was inspired by the lead singer Bart Millard's relationship with his father. His father was abusive in his early years but later had a transformation. Bart wrote the song as a way to imagine what it would be like to see his father in heaven, free from the pain and difficulties of his earthly life.
The fall of the Berlin Wall is a significant real story. It symbolized the end of the Cold War divide between East and West Germany. People on both sides of the wall were finally able to come together. It was a powerful moment that changed the political landscape not only in Germany but also in the whole of Europe.
Well, it could be about a person's wildest dreams or fantasies. Maybe it's a story where the narrator can only imagine certain events or situations because they are so extraordinary or out of reach in real life.