The Cathedral of Chalesm was a famous and beautiful building in the Milky Way galaxy. However, not only was it pulled down in order to build a new ion refinery, but the construction of the refinery took so long, and had to extend so far back into the past in order to allow ion production to start on time, that the Cathedral of Chalesm has now never been built in the first place. Picture postcards of the cathedral suddenly became and remain immensely valuable.
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