Château des fées, Medieval fortress ruins in Montcy-Notre-Dame, France.

Château des fées is a ruined medieval fortress at Le Waridon, above the Meuse and the Montcy-Saint-Pierre district of Charleville-Mézières. A broken grey-and-brown stone wall crosses the slope, rising on the right into the rough-block remnant of a tower or keep, while dense green foliage hides its lower courses. Excavations found a dry-stone wall marking a rectangular building of 18 by 10 metres.

The castle was probably built around 870. Excavations found traces of a fire dated to the late 10th or early 11th century by silver coins found in and outside the keep. In the early 16th century François d'Aspremont rebuilt it as a manor, and in 1534 Francis I banished and dismissed him. By 1629 the fortress was recorded as destroyed.

The name "château des Fées" appears in records from 1020, the year the fortress was destroyed, probably by troops of the archbishopric of Reims; it seems to be an alteration of "château défait" (ruined castle). Excavations found window lead, glassware, coins, arrowheads, crossbow bolts, seeds, ceramics and animal bones, now kept at the Musée de l'Ardenne in Charleville-Mézières.

The site sits on a steep slope, so sturdy footwear and care when moving about are necessary. The remains are accessible, but visitors should watch for uneven ground and rough rock formations.

Prosper Tarbé proposed in 1861 that this ruin is the legendary Montessor, fortress of the four sons of Aymon, and its silhouette also matches the castle of Oridon in medieval epic poems. Excavations from 1984 uncovered a dry-stone wall outlining a rectangular building of 18 by 10 metres.