Tourists have been unable to climb the Eiffel Tower in Paris for four days now due to a strike by employees. Dozens of workers demonstrated loudly in front of the landmark on Thursday and demanded better maintenance for it. They say rust is gnawing away at the tower, even as the city authorities rake in millions from ticket sales and cut back on maintenance. “It’s been standing for 135 years, but how much longer?” read one of the banners. “Milk cow Eiffel Tower” read another poster, which showed the mayor of Paris milking the tower. “The strike will continue until the city satisfies the worker…