A few of Hogwarts' stairways
Hogwarts has 142 staircases in total. Navigating them can be a challenge, as some are prone to moving. Some stairways have vanishing steps which, when stepped on, make their victim sink into them.
From the Story[]
"There are a hundred and forty-two staircases at Hogwarts, of all different shapes, sizes and styles, some of which lead to different places on different days."