This guided tour leads through underground air-raid shelters beneath the U-Bahnhof Gesundbrunnen, now part of the Berliner Unterwelten museum. It covers WWII bombing and air defence with bunker finds from the former government district, and touches on civilian underground history such as the pneumatic post, breweries and the U-Bahn line 8. Firm closed shoes are required, the site is not accessible without steps, and children under 7 cannot take part. It lasts about 90 minutes.

Details can change — check the event’s website before you go.