Château de Rougemont, Medieval castle ruins in Rougemont-le-Château, France.

Château de Rougemont is a ruined fortress on a hill at 736 m in the Vosges, facing the Jura plateaux. Its circular keep, built of rough grey and tan stone, replaced a 12th-century square tower and stands beside lower curtain walls. A rounded arch and a small rectangular window remain in one wall; scattered stones and crumbling fragments lie among the trees.

Built around the end of the 12th century for the Counts of Ferrette, the fortress guarded a Roman road from Langres and the southern entry to Alsace. When the Ferrette line died out in 1324, it passed by inheritance to the Habsburgs. Enguerrand VII, Lord of Coucy, destroyed it at the end of the 14th century; one source links the destruction to an English invasion in 1375.

The ruins reveal how medieval people organized their defensive structures and daily spaces within the stronghold. Walking through the remains, visitors can observe where fortifications stood and how the layout served both military and residential purposes.

The site is protected and open to explore, with ancient ditches and foundations clearly visible among the overgrown ground. Sturdy shoes are recommended as the terrain is uneven and the hilltop location requires some climbing effort.

Excavations from 1977 uncovered more than eight hundred crossbow bolts on the site, now kept in the museum at Belfort along with military, civil and religious finds. The digs also revealed that the circular keep replaced an earlier square tower of the 12th century.