Saarlouis Fortress

Saarlouis Fortress is a fortified town on the Saar River designed by the French military engineer Vauban, and its hexagonal outline still shapes the city center today. King Louis XIV had it founded in 1680 to secure France's eastern border. Ramparts, casemates, the German Gate and the Vauban Island survive. If you are looking for things to do in Saarlouis, you can walk through more than 300 years of fortress history here, from the Great Market to the old Saar branch.

History: Vauban and the Prussians

The town was laid out on the drawing board from 1680. Vauban planned it as a hexagon with six bastions, and the plans are credited to Thomas de Choisy. Its special feature was the inundation principle: at the sluice bridge, built between 1682 and 1684, the Saar could be dammed to flood the surrounding land. To protect that bridge a work called the Contregarde Vauban was added, now known as Vauban Island. After the Congress of Vienna, Saarlouis passed to Prussia in 1815, which expanded the fortress and built casemates between 1824 and 1829. The fortifications were demolished from 1887, but ramparts and ditches north of the center survived.

What to see

• Vauban Island: Set in the old Saar branch inside the city garden, it holds the monuments to Marshal Ney and to Soldier Lacroix.
• Casemates: The bombproof vaults along the main rampart now house restaurants.
• German Gate: The gatehouse was torn down in 1886; cannons from the 1870-71 war recall its role.
• Great Market: The former parade ground covers about 10,000 square meters and sits beside the commandant's building from 1680 to 1683.
• Bastion Albrecht (Bastion VI): A restaurant in the vaults and a viewing platform on top.

Visiting (as of October 2026)

Allow two to four hours for a relaxed walk. The remains are spread across town and free to visit; there is no admission fee and no fixed opening hours. A good starting point is the tourist office at Großer Markt 8. An open city tour with a focus on the French and Prussian fortress era leaves from there every Saturday at 11 a.m., lasts about two hours and costs 5 euros per person. Private tours can be booked in German, French, English, Italian, Spanish or Luxembourgish; book through the tourist office at +49 6831 444449.

How to get there

Saarlouis lies directly on the A8 motorway in western Saarland, near the border with Luxembourg and France, and the airports of Saarbrücken and Luxembourg are a few miles away. By train, Saarlouis can be reached from Saarbrücken on regional services (Deutsche Bahn). The German Gate and Vauban Island are a short walk north of the Great Market.

Nearby

In neighboring Ensdorf you can climb the Saar Polygon, a steel landmark with wide views. In town, the church of St. Ludwig on the Great Market and the municipal museum are worth a look.