Allow about two hours to explore this stronghold built near the German border in the 1930s as part of a French defense plan known as the Maginot Line.

Much of the structure is an underground system of tunnels designed to be a self-sufficient fortress and living quarters for about 600 military men. The original furniture and equipment is still in place.

Bring a jacket; the subterranean rooms are chilly.

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  Photo by Thomas Bresson
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  Photo by Jane Belinda Smith
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  Photo by Jane Belinda Smith
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  Photo by Lynne Morgan Sullivan
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  Photo by Lynne Morgan Sullivan
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  Photo by Paul Sullivan