Zavikon Island is home to a bridge which is only 32 feet in length that is considered the shortest international bridge in the world. It connects a Canadian island with an American island in the middle of the Saint Lawrence River.
The boundary agreement that was drafted between Canada and the United States declares that no island can be split into two territories. Two-thirds of the islands in this bunch, the Thousand Islands, belong to Canada, but the total area of the Canadian islands is roughly equal to the other one-third, which are considered to be American territory.
It just so happens that these two islands were joined by a bridge because the smaller island is owned by the same person who owns the house on the larger, Canadian island. They use the smaller island as a backyard. However, the truth of this has been questioned as a tourist ploy since the 1880s, with both islands being in Canada according to some sources.