The gut renovation of Cologne’s opera house is running eight years late and more than double the original budget — and that’s only up to now, since the basements are full of ductwork, cabling and pipes that were badly coordinated and may need to be completely redone. Munich’s Deutsche Museum renovation, Berlin’s Humboldt Forum and the Pergamon Museum are all similarly late and roughly half a billion euros or more each; the Stuttgart opera house renovation may cost a billion. “For a country that thrives on a reputation for efficiency and engineering prowess, its recent record is sobering.” Catherine Hickley looks at why things are going so wrong. – The New York Times