
On France’s Atlantic coast, a remarkable natural phenomenon has created one of the world’s most unusual roads. The Passage du Gois, a 4.125-kilometer (2.6-mile) causeway connecting the mainland town of Beauvoir-sur-Mer to the island of Noirmoutier, completely disappears underwater twice daily when high tide sweeps over it. With water levels reaching up to 4 meters (13 feet) during high tide, this remarkable road offers travelers a unique but time-sensitive journey.
The Passage du Gois wasn’t …