A military bunker located near the Czech-German border in the Karlovy Vary Region of Czechia. The alphanumeric designation '173/20/B2-90' follows a pattern consistent with standardized military fortification coding systems used in Central Europe during the mid-20th century. The structure is situated in a rural, forested area characteristic of the Sudetenland region, which was the site of extensive Czechoslovak border fortifications in the 1930s and later saw military activity during the Cold War.
The exact historical context, construction date, and specific function of this particular bunker are not confirmed by the available search results. Current physical condition and accessibility are unknown, though such sites in this region are often remnants of earlier defense systems and may be of interest to military heritage researchers and urban explorers.