The fort, which is at the entrance to the Aosta Valley, is located in a narrow gorge above the Dora Baltea river. It has been used for millennia to control the historic route between Italy and France. The current fortifications were built by Charles Albert of Savoy between 1830 and 1838. It replaced a 10th-century castle that had, itself, been built on an earlier structure founded by Theodoric I in the 5th century. The castle was under the control of the powerful local lords of Bard until the middle of the 13th century when ownership passed to the House of Savoy. Under their control, the defences were strengthened and improved. In 1800 Bonaparte ordered the fort to be razed to the ground. It was not until 1830 that Charles Albert of Savoy ordered that the fort be rebuilt. The task was entrusted to the famed Italian military engineer, Francesco Antonio Olivero.
By the end of the 19th century, the fort had lost its military value and fell into disuse. However, the Italian Army did continue to use the fort as a powder magazine. When it closed in 1975, ownership passed to the government of the Autonomous Region of Valle d’Aosta. In the 1980s the fort opened as a tourist attraction despite many buildings needing urgent repair.
In the late 1990s the fort was closed. It then underwent major restoration work. In 2006 Fort Bard reopened as the Museum of the Alps.