Western Approaches is a World War II museum, located in the basement of Exchange Flags, an office block in Liverpool City Centre.
During World War II, the building’s cellars were converted into a headquarters for the Battle of the Atlantic, the struggle to keep Britain supplied with essential supplies and equipment, as Nazi Germany’s U-Boats stalked vessels making the transatlantic crossing.
After the war, the complex was largely abandoned, and fell into disrepair until opened as a museum in the early 1990s.
The building was top secret at the time, and still seems to be rather well-hidden today, with many visitors to the city seemingly unaware of its existence. This is despite the big signs pointing to “TOP SECRET WARTIME HQ” – definitely one for fans of irony.