For Sale: An Abandoned, Decaying Fort on a Private Island - "PITY FORT MONTGOMERY. The years have not been kind to the three-story 19th-century structure falling to pieces in New York State where Lake Champlain meets the Richelieu River, right on the border between the United States and Canada. Over the centuries, some of the red bricks have crumbled, so archways look like mouths that are missing teeth. Brown leaves have tumbled in through the windows. Whatever limestone walls haven’t been claimed by plants have been marked up by humans brandishing paint, pens, blades, and a bawdy sense of humor. . . ."