Spain disputes Britain's three centuries of sovereignty over Gibraltar, a territory on the southern tip of Spain that is home to close to 30,000 people with an economy dominated by off-shore ...

Pedestrians and drivers cross the border from Spain to Gibraltar, in front of the Rock of Gibraltar, in La Linea de la Concepcion, southern Spain, June 4, 2024.

Gibraltar's economy, though, is linked to EU member Spain. About 15,000 people commute across the border daily. You literally walk across an isthmus that's got an airport runway on it, too.