[1] The island formerly featured one of the earliest examples of the large castles built in the Thousand Islands region during the late 19th and early 20th centuries, of which Boldt Castle is a surviving example.

[3] Construction of a castle began on the island in 1893, and was completed the following year.

Outbuildings and other improvements included a water tower, a lagoon for his steam yachts, a guesthouse, a boathouse and an ice house.

[5] Emery's second wife died on his birthday on July 20, 1907; in accordance to her wishes, she was allowed to pass away at the castle.

As of 2011, the island is owned by the Rawson family who use it for summer holidays.