Premise: Highfields was the home of Charles and Anne Lindbergh, the famous aviators. It was the location of the Lindbergh kidnapping, after which it was turned into a rehabilitation center. The home was added to the National Register of Historic Places in 1994.
Hypothesis: After the kidnapping of their daughter, the Lindberghs family home, Highfields, became a rehabilitation center and a formally recognized Historic Place in the 90's.