Which parts of the Reichstag building are open for tourists?

Question

I would like to visit the Reichstag building in Berlin, Germany and I wonder:

• Which parts of the building are open for tourists?
• Is it for free?
• Do I need a reservation?
• Are there any restrictions for non-German citizens?

Answer 1

This is the official website where you can get all the informations you asked for (in english as well): http://www.bundestag.de/htdocs_e/visits/index.jsp

Short summary:

• There are no restrictions for non-german citizens.
• You can participate in a guided tour and you can even watch a debate from the tribune of the reichstag for ~1 hour. You need a reservation for that, but you can do this online (see the link above).
• You need a reservation too, if you want to go to the dome ("kuppel") and the roofgarden ("dachterrasse"), but this is included in some of the offers available I believe.
• You may also visit a congressman with a group of >10 visitors, but you will need an early reservation for this.