Where is the world's longest continuous staircase?

If you're keen on climbing over 11,000 steps in a single workout without using an indoor stepper or going back down between ascents, the annual Niesen Stairway Run on the Swiss mountain of the same name gives you the chance of doing these Guinness-recognized longest stairs. It is the service staircase for the tracks of a funicular railway for about 3500 meters with an elevation change of 1643 meters. If you take that challenge, you have a time limit of 2:20 hours to finish - a pace slightly better than one step per second!

(Technically, the staircase might not be called 100% continuous as there is an interchange station on the funicular, so there's a few meters between the lower and upper section. If you count that as an interruption, the lower section would be the record holder as it's longer and higher than the upper one.)

https://en.wikipedia.org/wiki/Niesenbahn
https://www.niesen.ch/treppenlauf/ (in German)