Boldt Castle on Heart Island - The re-shaped island and Castle is only accessible by water, with tours starting in Alexandria Bay or Clayton, NY and Ontario, Canada. It is only open from mid-May to mid-October.
The Power House at/for Boldt Castle is attached to Heart Island by this awesome bridge. Located in the St. Lawrence river in the 1000 Islands region of New York. Built in the very early 1900's to house two generators. Boldt castle can be visited and rented for weddings!