The Palau de la Música Catalana was squeezed onto a plot so tight that nobody could stand back and look at it, so Lluís Domènech i Montaner put the whole display inside. He built it between 1905 and 1908 for the Orfeó Català, a choral society of amateur singers who commissioned the hall for themselves. An iron frame carries the weight, so the outer walls no longer had to hold anything up: they became curtains of coloured glass, and the auditorium was designed to be lit by daylight alone.
Inside, 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 cover the ceilings, mosaic runs up the columns, and because the side walls are glass as well, daylight reaches you from three directions at once. It is still a working hall rather than a museum: the Orfeó sings here alongside symphony, flamenco and jazz, and UNESCO added the building to the World Heritage list in 1997.