The Palau de la Música Catalana is a concert hall whose walls are curtains of coloured glass. An iron frame carries the weight, so the outer walls hold nothing up, and the auditorium was designed to be lit by daylight alone. The ceiling comes down to meet you: an inverted bell of stained glass with a sun at its centre, ringed by women's faces. Behind the stage, eighteen muses emerge from the wall, flat mosaic below the waist and full sculpture above.
Every surface is decorated — rosettes across the ceilings, mosaic up the columns — and because the side walls are glass as well, daylight reaches you from three directions at once. Lluís Domènech i Montaner built it between 1905 and 1908 for the Orfeó Català, a choral society of amateur singers who commissioned the hall for themselves. The plot was so tight that nobody could stand back and look at the outside, which is why the whole display is indoors. It is still a working hall rather than a museum.