Bunker 703, Deep bunker and museum in Moscow, Russia.
Bunker 703 is an underground facility in central Moscow positioned 65 meters below street level and connected to other areas through four separate tunnels. The space covers around 7,000 square meters and features walls reinforced with cast iron for structural protection.
The facility was constructed during the Cold War to serve as a classified storage site for the Ministry of Foreign Affairs. After being declassified in 2018, the site opened to visitors.
The facility contains preserved Cold War artifacts and original documentation storage areas, reflecting Soviet military engineering and defense strategies.
Access requires walking down roughly 50 meters of stairs without any lift available. People with mobility challenges or discomfort in enclosed spaces should consider this before planning a visit.
The facility still houses its original equipment from the Cold War era, including operational sirens designed to alert occupants of nuclear attacks. Radiation detection instruments also remain in place in their original condition.
Website: https://bunker703.ru/museum
GPS coordinates: 55.73438,37.63040
Latest update: December 3, 2025 14:03
This collection brings together underground military sites, strategic bunkers, and highly secured installations across the world. Many of these places were built during the Cold War, when nuclear threats pushed governments to create protected command centers deep under mountains or in remote areas. Some remain active today, serving national security purposes, while others have been decommissioned but preserve their massive concrete structures and tunnels. Though their existence is known from public sources, access remains strictly forbidden. The sites include the Raven Rock Mountain Complex in Pennsylvania, carved deep into the Appalachian Mountains with tunnels stretching for miles through solid rock, and the Cheyenne Mountain Space Force Station in Colorado, where rooms rest on massive springs inside the Rocky Mountains to absorb shocks from potential attacks. In Russia, the Skalisty submarine base serves nuclear submarines through underground piers carved directly into rock along the Barents Sea. RAF Menwith Hill in North Yorkshire spreads across a wide area marked by white geodesic domes that protect satellite antennas, while the Svalbard Global Seed Vault lies embedded in arctic permafrost, storing millions of plant seeds behind thick concrete walls. These places show how governments sought to protect command systems, military operations, and even biological reserves by building deep into mountains or along remote coastlines, creating installations that remain largely hidden from public view.
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