Fort de Chillon is a National Redoubt military fortification dug into the mountain above the medieval Château de Chillon. Built between 1941 and 1943, it can be explored on a guided tour through its tunnels, casemates and technical installations.
Fortresses & fortifications
Main highlights
- A National Redoubt fort carved into the rock above Lake Geneva between 1941 and 1943
- Underground tunnels stretching several hundred metres, with casemates and firing posts
- Original weaponry preserved : fortress guns, machine guns and camouflaged loopholes
Overview
Fort de Chillon is a Swiss military fortification built between 1941 and 1943 as part of the National Redoubt, the defensive strategy adopted during the Second World War. It belongs to a network of fortifications tasked with protecting the country’s main transport routes. It is a largely underground structure, carved into the rock above the medieval castle.
Its mission was to control the Simplon road, which runs along Lake Geneva between Italy and Switzerland, and to monitor rail and lake traffic. It remained in service and classified as a military secret until the 1990s, after which it was decommissioned and partly opened to the public.
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Things to see and do
The tour follows a network of tunnels extending several hundred metres into the mountain. You walk through artillery casemates, observation posts and firing chambers. Technical installations such as ventilation, generators and gas filters show how the garrison was meant to be self-sufficient during a prolonged conflict.
The fort retains some of its original weaponry, including fortress guns and machine guns. You can also see the system of camouflaged loopholes that allowed defenders to control the approaches without being seen. A collection of uniforms, communications equipment and soldiers’ everyday items rounds off the visit.
Themed guided tours cover Swiss defensive strategy, soldiers’ life inside the fort and how these fortifications were built. They are often led by former servicemen.
Practical information
Getting there : from Veytaux-Chillon station, follow the signs for a climb of about 20 minutes. By car, park near the castle and take the waymarked path.
Visits : guided tours only, with group tours available by reservation.
Accessibility : the site is not suitable for people with reduced mobility due to stairs and narrow passages.
Visitor tips
The temperature inside stays around 12 °C all year round, so bring warm clothing. Wear sturdy shoes, as the tunnel floors can be uneven.
Book ahead, especially in high season, as group sizes are limited.
Nearby attractions
- Château de Chillon is a medieval fortress on the shores of Lake Geneva, just below.
- The Gorges du Chauderon, above Montreux, can be explored along a shady trail punctuated by stairs.
- Fort de Cindey is an underground fortress dug into the Saint-Maurice gorge between 1941 and 1946.
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