In the 19th and early 20th centuries, Vladivostok was a vast military zone with a string of fortifications. Even today, it remains an important military center as the home of Russia’s Pacific fleet, and you can spend days just visiting the complex of forts built by Russia’s top military engineers. An artillery battery that faces Amur Bay and long protected the old town is now the cool Vladivostok Fortress Museum. Exhibits within the citadel range from weapons and armor from the Middle Ages to displays that tell the story of the fort’s construction. On top of the building, heavy guns stand as if still at the ready.