The Fosse Dionne: France’s mysterious underground spring

The Fosse Dionne: France’s mysterious underground spring

In the heart of France’s idyllic Burgundy region, surrounded by manicured vineyards, fortified Renaissance chateaux and medieval hill towns, sits one of the bucolic area’s most mysterious attractions: a seemingly bottomless spring-fed pit in the small town of Tonnarre known as the Fosse Dionne.

mystery water well

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