• Register online in advance with every visitor's full name and date of birth, since requests without a complete list are not processed
• Bring original ID for everyone, checked at registration and again at the entrance; anyone 16 or over needs an official photo ID, and copies are refused
• No booking? Try the service center in front of the building on Platz der Republik, which gives out spare slots at least two hours ahead

The glass dome on the roof of the Reichstag Building, home of the German parliament, has a spiral ramp that winds up around a mirrored cone to an open top. Kids can look down through the glass into the plenary chamber, then walk the roof terrace for views over the government district and city landmarks.

Audioguides on the terrace come in twelve languages, with a children's version in German.