Mainly to see Heart Island. It is said that Bolt Castle was the richest man in the United States in the early last century after Bolt bought the Heart Island to build a most luxurious castle for his wife. Since 1900, the castle has been built for four years. Unexpectedly, Bolt's wife died before the castle was almost completed, so Bolt never stepped on Heart Island again. Later, Heart Island was bought by the US government and developed into a tourist attraction in Qiandao Lake District. Sure enough, the building with the story can stimulate imagination.