This Nazi-era bunker shelters one of Berlin's finest private contemporary art collections. Advertising guru Christian Boros acquired the behemoth in 2003 and converted it into a shining beacon of art. Book online (weeks, if not months, ahead!) to join a guided tour (also in English) of works by such hotshots as Wolfgang Tillmans, Olafur Eliasson and Ai Weiwei, and to pick up fascinating nuggets about the building's past incarnations.

Exhibits are drawn from all media – sculpture to painting, video to photography, installations to drawing – with many of them site-specific. The exhibition kicks off with Boros' favourite (and Berlin resident) Olafur Eliasson, whose brass-and-mirror Orientation Star is cleverly juxtaposed with Colour Experiment No 10. A major eye-catcher is Ai Weiwei's 6m-tall Tree, whose installation required cutting out ceilings and walls. Boros is also big on championing new artists, which is why not-yet-household names like Alicja Kwade, Klara Lidén, Thea Djordjadze, Michael Sailstorfer and Danh Vo are also featured quite prominently.

During the tour you'll be peppered with historical details of the war-scarred shelter with its preserved original fittings, pipes, steel doors and vents. Built for 2000 people, its dank rooms crammed in twice as many during the heaviest air raids towards the end of WWII. After the shooting stopped, the Soviets briefly used it as a POW prison before it assumed a more benign role as a fruit and vegetable storeroom in East Berlin, a phase that spawned the nickname 'Banana Bunker'. In the 1990s, the claustrophobic warren saw some of Berlin's naughtiest techno raves and fetish parties.