East German leader
Erich Honecker's three-story underground complex will open for just three months:
Groups will be given short tours through the ill-lit complex - where they will see offices and control rooms once intended for the elites, now covered in green slime and reeking of mould.
They will be led along submarine-like tunnels divided by heavy metal doors, leading on to 170 rooms.
The three storeys reach a depth of 70m (230ft) below ground.
The bunker was fitted with a fountain, air conditioning and "springed" rooms able to cushion residents from detonations.
