Proto, NATO underground military base in Province of Caserta, Italy
Proto is an underground military facility built inside Mount Massico, in the Province of Caserta, with a network of tunnels served by three entrances, two leading to the main passage and one reserved for emergencies. The structure was fitted with pressurized air systems, electromagnetic shielding, radiation barriers, and backup power generators.
The bunker was built between 1955 and 1961 to serve as a command post for Allied Forces Southern Europe, designed to withstand nuclear, chemical, and biological threats. It remained in operation until 1996, when it was decommissioned after the end of the Cold War.
Proto is now open to the public as a museum, giving visitors a direct look at how a Cold War command center operated from day to day. The original rooms and equipment are still in place, making the visit feel more like a real site than a reconstruction.
The inside of the bunker stays cool year round, so bringing a layer of warm clothing is a good idea even in summer. Sturdy shoes are also useful, as the tunnels involve uneven surfaces and some long walking distances.
The facility was designed to operate for up to eight weeks without any outside supply, making it entirely self-sufficient underground. Despite its size, almost nothing is visible from the surface, since the whole structure was tucked inside the mountain.
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