Great guides that offer a different perspective of Berlin. Take a guided tour of underground bunkers where civilians and military sheltered during WWII. Fantastic atmosphere, enthusiastic and knowledgeable multilingual tour guides. The tours are run by The Berlin Undergrounds Association who are a group of enthusiastic volunteers.
Also perfect activity for wet days, snowy weather and when it is bitingly cold outside. Pre-booking is recommended and there is a great website with lots of extra information. It is not really a suitable trip for little children and people with special accessibility requirements might want to check in advance if the tour is suitable.
Tours cost around 10Euros and last a couple of hours.
berliner-unterwelten.de/guided-tours.3.1.html
+49 (30) 499 105-17
Is this your business?