The stairs were climbed by Gustave Eiffel to inaugurate the tower A part of the Eiffel Tower's iron spiral staircase is set to go under the hammer at an auction in Paris.The 4.5m (14.7ft), 20-step section, which once linked the tower's second and third levels, is expected to fetch up to 30,000 euros ($44,000; £21,000). It was one of 24 sections removed in 1983 to make room for new lifts. The 324m tower, built by Gustave Eiffel for the 1889 Universal Exhibition, is the world's most popular monument, drawing six million visitors a year. It was the tallest building...