A part of the Eiffel Tower's iron spiral staircase is set to go under the hammer at an auction in Paris.
The stairs were climbed by Gustave Eiffel to inaugurate the tower
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 in the world at the time of its construction.
The staircase on sale at the Hotel Drouot auction house was climbed by Gustave Eiffel to inaugurate his tower in 1889.
EIFFEL TOWER FACTS
Built in 1887 by engineer Gustave Eiffel
The iron structure is 324m (1,063 ft) high
6.7 million people visited the tower last year
It may also be the last piece available to the public, as the other 23 sections have already been bought by museums and collectors around the world.
The auctioneer, Remi Ader, said it would be difficult to estimate what its sale might eventually raise.
"I said 20,000 to 30,000 euros ($29,000-44,000), but that's in theory because at that price I know that five, 10, perhaps 20 people are interested," he told the Associated Press.
"That is where the auction will begin. After that, it's hard to tell."
Potential bidders have been warned the staircase section weighs 700kg.