A military bunker located near Česká Lípa in the Liberec Region of Czechia. The alphanumeric designation 'III/156a/B' follows a pattern used for Czechoslovak border fortifications constructed in the 1930s in response to the threat of Nazi Germany. This region was part of the fortified Czechoslovak border defense system, known as the 'Czechoslovak border fortifications,' built primarily between 1935 and 1938.
The structure is situated in a forested area close to the historical German border. Its current physical state and accessibility are not confirmed by available information.