If dreams really do come true, you could say that the Scottish Highland castle of Eilean Donan is proof.
Aye, the story — it goes something like this.
It was the early 1900s. Eilean Donan castle had been destroyed over 200 years earlier, and nothing but rubble remained on the island where it had once stood. A man named Farquhar MacRae was commissioned to help rebuild the castle, to restore the structure to its previous glory and grandeur. The only problem: there were no plans of the original structure that could guide its reconstruction.
Then, one night, a vision of the original castle in elaborate detail came to Farquhar in his dreams. With the dream fresh, he hastily scribbled and sketched his vision. He eventually completed the plans and the castle was rebuilt accordingly.
Years later, long after the Eilean Donan Castle reconstruction was completed, someone had discovered the original architectural plans for it in the Edinburgh Castle archives. When specialists compared MacRae's dream-vision reconstruction to that of the original plans, they found something quite remarkable: MacRae's dream and the original plans were 98% the same.
The 2% that differed? We don't know. But we'll take 2% as the margin of error on dreams coming true, any day.