Bratislava fortifications usually refers to the medieval city fortifications of Bratislava, the capital of Slovakia, of which one gate and two sections of walls remain today. The Bratislava Castle was also heavily fortified. Other fortification systems were built in the following centuries, including a World War I artillery fortification system and World War I shelters, system of bunkers and fortifications built by the First Czechoslovak Republic between the World Wars, World War II aircraft raid shelters, fortifications built by the Nazi Germany in the city during World War II and finally Cold War-era city defenses including a system of 8,602 air raid and nuclear shelters capable of holding over 760,000 citizens, far more than the number of inhabitants. The pinnacle of the communist era c