Climbing the glass dome of the Bundestag is unforgettable. We hadn't pre-registered online so we lined up with others in the 'spontaneous visits' queue.
Everyone is given the option of head phones in their own language and as you progress up the ramp of the dome the headphones tell you when to stop, which direction to look and then tells stories about what you are seeing. It is an ingenious system because the device seems to be triggered by your position so you can go at your own pace.
From the top you can look right down into the parliamentary chamber. A moveable sun screen made of metal bars (picture 2) follows the sun so the chamber is protected from the heat and doesn't cost as much to cool.
One thing I like about Germany is that although they have rules they are perfectly willing to bend them. We had turned up 40 minutes earlier than our allocated time slot but were waved through without a problem.