A military bunker located near Kostelec nad Černými lesy, Czechia, at coordinates 49.924715,13.094285. The site is part of a network of Cold War-era fortifications constructed by the Czechoslovak People's Army under Soviet military guidance. These bunkers were designed as part of the national defense system to serve as command outposts, ammunition storage points, or observation posts along key transit corridors in central Bohemia.
The bunker's designation, D-20/26/A-140, follows the standardized Czechoslovak military coding system used during the 1960s–1980s for underground installations. While no public records confirm its exact function, similar structures in the region typically featured reinforced concrete walls, blast doors, and minimal above-ground exposure. The area around Kostelec nad Černými lesy was strategically positioned near rail lines and forested terrain, making it suitable for隐蔽 (concealed) military infrastructure.
Today, the bunker remains largely intact but inaccessible and unmarked. It is not listed as a protected heritage site, and there is no official documentation of its current condition or ownership. Urban explorers occasionally document such sites, contributing to the growing archive of Cold War bunkers in Central Europe. Due to the lack of verified technical data, its armament, crew size, and construction date cannot be confirmed.
This structure exemplifies the widespread, low-profile fortifications that formed the backbone of Eastern Bloc defense strategy during the Cold War. As NATO members increase defense spending amid regional tensions, sites like this serve as silent reminders of the region’s layered military history.