The spiral walkway inside the cupola is similar to that inside City Hall in London.
Reichstagsgebäude was totally renovated and redesigned by Foster and Partners.
The building's electricity is generated by burning bio-fuel made from vegetable oil - which is cleaner than fossil fuels - with surplus heat used to heat water stored in an underground aquifer 300 metres (984 feet) below ground which can be pumped up to heat the building or used to chill water.
1933 partly destroyed (Reichstagsbrand), 1995 wrapped by artist Christo; since 1999 official seat of Bundestag (parliament)
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