The amazing #bristishmuseum #london #greatcourt

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The Great Court at the British Museum is the largest covered square in Europe, so the roof needs to be pretty big. It is made up of 3,312 panes of glass, and they are all different because the Reading Room isn’t centrally located in the Great Court. A roof this size is no trifling matter – it takes two weeks to do a complete clean.

Source: http://blog.britishmuseum.org/29-things-you-probably-didnt-know-about-the-british-museum/