This monolithic building, which used to stretch all the way to Marszałkowska Street, housed a number of important organisations before being destroyed by German bombing in early September 1944.

Apart from housing the Polish Home Army headquarters, the PKO building also had a sanitary point which was later converted into a field hospital, providing beds and sanitation for up to 400 wounded combatants at a time.

The building was so large it also accommodated a POW holding centre for Germans taken captive following the storming of the PAST building on Zielna Street. Meanwhile, the building’s third floor played host to the “Błyskawica” – or “Lightning” – insurgent radio station.

How to listen:

Unseen is available as a downloadable podcast, although it is best experienced through the Echoes geolocative storytelling app available for iOS and Android. After loading the app, search for soundwalks in Warsaw and you’ll find Unseen.