Water fortifications were deemed necessary on the east coast of the Soviet Union to protect against possible attacks from Japan. In the southeast of Russia, Vladivostok is the largest port city on the Pacific Ocean. The fort and miles of tunnels featured in the photographs above have since fallen in disarray, but were once a highly prized (and extravagantly expensive) Russian defense construction project. Today it is a destination for Russian and other visitors complete with antiquated bombs and guided tours.
