The women who carry goods worth billions across a north African border; the island that is in both France and Spain; the houses that are in both Canada and the United States; and the points where three time zones meet.
Every year the Mules of Melilla carry billions of Euros worth of goods across the border from Morocco, thanks to an idiosyncrasy of EU customs duty.
Île des Faisans / Isla de los Faisanes is French territory for half the year, and Spanish for the rest of the year.
The Haskell Free Library and Opera House sits on the border between Derby Line, Vermont, and Stanstead, Quebec, with a giant black line separating the two.
Time zone tripoints mark the place where three time zones meet. Northern Europe, Central Asia, and East Asia each have one – but Australia has three.