A Vista With Nothing to See — US–Canada Border
Many of the world’s borders are invisible, but the boundary between Canada and the US is actually marked by an absence. Officially title ‘the vista’, it is a barren strip of land 6 m (20 ft) wide, stretching through 2,171 km (1,349 mi) of forest. Although there’s nothing there to stop you from doing it, crossing the ‘slash’, as it’s informally known, is a serious offence.