Cologne’s famous cathedral is going dark to save electricity, as Germany grapples with an energy supply crisis and soaring prices. The ancient city on the Rhine is turning off all the lights on its many representative buildings – the most famous of which is the cathedral itself – from 11 pm every evening, the city authorities said. Switch-off time will go to 10 pm once autumn sets in. Normally, the famous Gothic cathedral is illuminated through the hours of darkness. The city authorities said the decision had been prompted by the war in Ukraine and the sanctions imposed by Germany on Russian o…