Heart Island, located in the Thousand Islands archipelago on the Saint Lawrence River between the United States and Canada, is renowned for its iconic and captivating attraction, Boldt Castle. Commissioned by millionaire hotel magnate George C. Boldt in the early 20th century as a testament of love for his wife, Louise, the castle remains an architectural marvel. The island, shaped like a heart, adds a layer of romance to the rich history and tragic tale of the castle. Construction of Boldt Castle came to an abrupt halt in 1904 when Louise Boldt passed away suddenly, leading George Boldt to cease all work on the project, leaving the castle unfinished and in a state of disrepair for decades.

Boldt Castle, with its grandeur and European-inspired design, stands as a testament to the Gilded Age opulence. Its architecture blends various styles, including Rhineland and Gothic Revival, creating a captivating and unique aesthetic. The castle features tunnels, turrets, and terraced gardens, showcasing the meticulous craftsmanship of the artisans who worked on the project. In 1977, the Thousand Islands Bridge Authority acquired the island and embarked on an ambitious restoration project to preserve and complete the castle, allowing visitors to explore the once-forlorn estate. Today, Heart Island and Boldt Castle attract tourists from around the world, offering a glimpse into the extravagant vision of a bygone era and serving as a symbol of enduring love despite the tragedy that initially halted its construction.