One of the least-known uses of the St Pietersberg quarry tunnels was as a once-top-secret NATO HQ to be used in times of nuclear conflict. The hospital-like tiled interior, abandoned in 1992, remains relatively intact but as yet the site can only be visited on rare guided tours, one weekend a month. Book online.
NATO War Command
Maastricht
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Set within a deep-cut dry moat, this hefty five-sided brick fort once formed the city's southern defence and is linked to a network of underground tunnels…
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