Final answer:
The unsettling revelation the speaker makes about their neighborhood is the existence of removed Aboriginal children.
Step-by-step explanation:
The unsettling revelation the speaker makes about their neighborhood is the existence of removed Aboriginal children. The passage mentions that the neighborhood is rich in legendary treasures and local tales, but the speaker goes on to say that the presence of ghosts and apparitions is the most prevalent. Additionally, the speaker notes that ghosts are rarely heard of except in long-established Dutch communities, suggesting that the neighborhood has a history with removed Aboriginal children.