The Atominis Bunkeris (Atomic Bunker) in Kaunas, Lithuania, is a preserved Cold War-era nuclear shelter originally constructed for the Russian army. Located approximately 6 meters underground, the facility has been renovated and operates as a private museum, showcasing one of the world's largest collections of gas masks and Cold War espionage equipment. Its exhibits include over 1,200 functioning gas masks for adults, children, and even horses, alongside more than 8,500 items of spy technology used by the KGB, NKVD, and other intelligence services.
Geographically, the bunker is situated within Kaunas, Lithuania's second-largest city, which held strategic importance during the Soviet period. The structure represents the extensive network of underground shelters built across the Soviet sphere to protect personnel and equipment from nuclear attack. Its conversion into a museum provides a rare, tangible insight into Cold War civil defense protocols and the pervasive atmosphere of surveillance.
Today, the Atomic Bunker serves as a unique historical and educational site, attracting visitors interested in military heritage, Cold War history, and urban exploration (urbex). The museum's comprehensive and specialized collection makes it an internationally notable destination for understanding 20th-century fortification and intelligence practices. The site stands as a verified testament to the era's defensive infrastructure and is maintained as a accessible public attraction.