The weathering rate of medieval wall paintings at the church of Zell in Switzerland skyrocketed as indoor heating was installed in 1959. Historic photos by the Cantonal heritage authorities, Zurich

By | Published October 20, 2010 | Full size is 567 × 843 pixels

The weathering rate of medieval wall paintings at the church of Zell in Switzerland skyrocketed as indoor heating was installed in 1959. Historic photos by the Cantonal heritage authorities, Zurich

The weathering rate of medieval wall paintings at the church of Zell in Switzerland skyrocketed as indoor heating was installed in 1959. Historic photos by the Cantonal heritage authorities, Zurich

The weathering rate of medieval wall paintings at the church of Zell in Switzerland skyrocketed as indoor heating was installed in 1959. Historic photos by the Cantonal heritage authorities, Zurich

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