Barrage Vauban
The walk begins at Vauban's 120-meter sandstone dam, completed in 1690 as a military defense that could flood the entire southern approach to the city by raising the River Ill behind it. The engineering is grimly practical: by blocking the water flow, the French garrison could turn the surrounding fields into an impassable swamp within hours. Today the interior corridor functions as a gallery space, but the real draw is the rooftop terrace. Climb to the top for a panoramic view that takes in the Ponts Couverts towers, the Petite France quarter, and the cathedral spire rising above the rooftops. Open daily from 7:15 AM to 9:00 PM. Admission is 7 EUR. Come early in the morning when the terrace is nearly empty and the light on the canal is at its best.
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