The Glass Museum covers 400 square metres in the old lamp works of the Bois du Cazier coal works, whose architects have successfully preserved its original features. A glass annex completes the building, and a mezzanine doubles the amount of floor space available, so as to optimise the layout. Its architecture, which is open to the outside, combined with the determination to respect what was already there, is all about transparent spaces and the gleam of glass, helping to make the integration of the site so coherent. This is a new setting for the Glass Museum, which has been developing its projects and activities here since 2007.