A bibliophile’s idea of heaven, the central building for the Stockholm Public Library is one of the world’s most beautiful libraries, and changed the city’s relationship with books when it opened in 1928. That’s down to the monumental rotunda at the top of the building.

This is a gigantic hall encircled with bookshelves, and for the first time readers could seek out the book they needed by themselves without having to consult the librarians.