During the Merovingian period, Sainte Odile, daughter of the Duke Adalric, founded a prosperous monastery. In the Middle Ages, the monastery was destroyed and rebuilt by Herrade Landsberg.
Destroyed and desecrated for centuries, Mont Sainte-Odile became the property of the Bishop of
Strasbourg in 1853. Sainte-Odile is worshipped as the patron saint of Alsace. The Roman type church, the Church of St. Mary of the seventeenth century, the sundial, the site and the view are remarkable.
A walking trail goes around the rock on which the monastery is built.
The history of the city is, in fact, closely linked to that of its abbey. The first abbey was founded in the sixth century by Irish monks, conducted by St. Columban. A new lease was given to the abbey in the eighth century by Abbot Maurus that has been its name since: Mauri Monasterum, later transformed into Marmoutier. The Abbey manages a vast territory, called Marmoutier. It is a period of prosperity and spiritual influence with the introduction of the Benedictine rule. In the twelfth century, a church was built with the imposing massive west side we know today. The fourteenth and fifteenth centuries saw the decline of the Abbey, ruined by the owners of the city family, the Geroldseck. The Peasants'
War in 1525 and the Thirty Year War caused the destruction and looting of some buildings of the
Abbey. Marmoutier, came under the French rule after the Thirty Year War, reborn (reconstruction of chorus) and prospered until the Revolution. Then, the monastery buildings were destroyed or sold.

The Strasbourg Cathedral or the Cathedral of Our Lady of Strasbourg (French: Cathédrale Notre-
Dame-de-Strasbourg, German: Liebfrauenmünster zu Straßburg) is a Roman Catholic cathedral in
Strasbourg, France. Although considerable parts of it are still iof Roman architecture, it is widely considered to be among the finest examples of high, or late, Gothic architecture. Erwin von Steinbach is credited for major contributions from 1277 to his death in 1318.
With 142 metres, it was the world's tallest building from 1647 to 1874, when it was bypassed by St.
Nikolai's Church, Hamburg. Today it is the sixth-tallest church in the world.
Described by Victor Hugo as a "gigantic and delicate marvel", the cathedral is visible far across the plain of Alsace and can be seen from as far off as the Vosges Mountains or the Black Forest on the other side of the Rhine. The Sandstone from the Vosges used in the buildings construction gives the cathedral its characteristic pink hue.
For over nine centuries, the abbey of Oelenberg, is the only survivor of the many monasteries in
Alsace. located on a recent Sundgau Hill, 15 km west of Mulhouse, the Abbey has shared the joys and misforunes of this region.
In 1046, Heilwig Dabo, Countess of Eguisheim, mother of Pope Leo IX, founded on the hill (Berg), along a river (Oelen), a priory of Canon Regular of St. Augustine, were probably her son Gerard, who died tragically during a quarrel with the Earl of Ribeaupierre, was buried. Leo IX consecrated the church in 1049 and laid the relics of St. Romain, a martyr. Very prosperous in the thirteenth century, the monastery was ruined by the wars in the fourteenth century. its decline grew until the sixteenth century. In 1626, the Abbey was at the Jesuit college of Freiburg, and the University of that city in
1774. During the Revolution, the Abbey buildings were sold to a company owner of Mulhouse. Resold in 1821 to a priest, the former monastery became a school for young girls.