Thann (; Alsatian: Dànn, , ) is a commune in the northeastern French department of Haut-Rhin, in Grand Est. It is the sous-préfecture of the arrondissement of Thann-Guebwiller and part of the canton of Cernay. Its inhabitants are known as Thannois. Geography Thann is situated at the foot of the Vosges mountains, where the valley of the river Thur enters the Upper Rhine Plain. The Thur runs through the middle of the town. History In 1635, during the Thirty Years' War, Thann was taken by imperialist forces. A mercenary among those troops described it as a "beautiful city, which lies on a mountain and is strongly fortified." Demographic evolution Transport Thann is 43 km from Colmar and 21 km from Mulhouse. The town is also well situated for the French autoroute network such as the A35 and A36. The RN66 (Route Nationale 66) passes through Thann, providing an east-west route between Mulhouse and Épinal. Thann and the Thur valley are served by regular TER trains on a branch line running from Mulhouse to Kruth. A new tram-train service of the Mulhouse tramway links Thann to the city centre of Mulhouse. Architectural heritage Despite sustaining heavy damage in World War I and World War II, Thann contains several old buildings and monuments of significance. La Collégiale Saint-Thiébaut Situated in the centre of the old town, the church known as the Collégiale is good example of the style of Gothic architecture that flourished in the Rhine valley in the late Middle Ages. The Cathedrals of Strasbourg and Freiburg in Germany are also built in a similar style. The building owes its name "La collégiale" to the college of monks who moved to Thann from the nearby town of Saint-Amarin in 1442. Construction of the collégiale took more than 200 years, from the end of the 13th Century through the 15th Century, and was completed in 1516 with the 78m tall spire. For an extensive study of the Thann collegiate church, circumstances of its erection, issues of patronage, and unique sculptural programs, see Assaf Pinkus, Workshops and Patrons of St. Theobald in Thann (Waxmann Verlag: Muenster, Berlin, New York, 2006). La Tour des Sorcières (The Witches' Tower) This was a tower in the old town walls, and built in 1411. The bulbous roof dates from 1628. Today the interior houses a museum dedicated to winemaking. Le Château de l'Engelbourg (Engelbourg Castle) The ruins