Château de Longevialle, Historical castle in Val-d'Arcomie, France.

Château de Longevialle is a castle in Val-d'Arcomie with a U-shaped layout comprising a central block and two symmetrical wings. The structure rises across two main stories topped by an attic level, displaying the classical proportions of French manor architecture.

The seigneurie passed to the Falcon family through the 1690 marriage of Antoine-Guérin Falcon to Marie-Gabrielle Mamet, heiress of the Paparin dame de Longevialle. The Mérimée database dates the present building to the first quarter of the 18th century. Expropriated in 1958 for the Grandval dam, the castle lost its two projecting wings; EDF ceded the main block in 1961, and restoration began in the late 1970s.

The Falcon family, originally from Le Malzieu in Gévaudan, took the name Longevialle after Antoine-Guérin Falcon married Marie-Gabrielle Mamet in 1690. The family kept the estate until 1958. The lord's quarters and the farmers' quarters shared the building, the latter at the north end of the main block, opening directly onto the stable and barn in the right wing.

The castle is a private residence, so visitors should verify access conditions before planning a visit. Contacting local tourist information or the property owner ahead of time is advisable.

The staircase of honour is open à la française and serves each floor by three flights, carried on four monolithic granite columns with capitals and edged by a wrought-iron rail. It is, with the facades and roofs, the only element covered by the 1986 listing order. The master's lodging and the farmers' lodging share the building, the latter at the north end of the main block, communicating directly with the stable and barn in the right wing.