The interior of an old bunker, Margival.

Some training equipment to let the FBI playing war. Those equipment use an old bunker as main structure

The height of the Loyasse was built between 1836 and 1840. Here, within a stronghold in the north of the structure.

This staircase is equipped with side rails, used to move up the artillery. Artillery was heavy guns mounted on wheels. A typical arrangement for bunker of this days.

The stairs cross of the peak battery. The corridor down the room leads to the research center, while the two others leads to the main ramparts.

One of the tanks on the top floor, with plumbing. It is assumed that this was the source of drinking water from underground center.

Control Room of the NATO radar base, the fort of Mount Salbert.

Fort Lefebvre culminates at the top of Mount Salbert 650m altitude. It said a strong "Sere River". It was built from 1874 to 1877. On May 12, 1955, NATO reuses the fort to house a communications center and a radar base. The book is officially delivered to the Air Force ole March 26, 1958. The book "G" Air Defense Planning (DAT) has 7 radio antennas. The old fort is used as a barracks for soldiers.

The radar base is not exactly the strong, but under the fort. Access from the fort is a long staircase of 322 stairs that descends into a concrete wall strongly.

The site is no longer running quickly but it remains occupied by the army until 1972. The mayor of Belfort is the current owner. It secures the site is now a promenade.