Introduction to Boldt Castle: Boldt Castle is an ancient castle built on the water. It is a brown brick and stone building with three floors and one hundred and twenty rooms. , five spiers in the shape of a tower, with a clock embedded on them, connected to the island at one end by a small bridge. This castle was built by a wealthy man named George Bolt in 1900 for his frail wife at a cost of US$25 million. Four years later, before the castle was completed, his wife died of illness. Leave him alone. George Bolt missed his beloved wife day and night and never set foot on the island again, so he "sold" the castle to the country for one dollar. In order to commemorate him, people named the island Heart Island.