The Greatest Spiral Staircases
Atlas Obscura has compiled the most intriguing, dizzying spiral staircases from around the world.
Unique triple helix spiral staircase in the Museum do Pobo Galego, Spain. Technically, there is no such thing as a spiral staircase - spirals are by their nature flat - and all "spiral" stairs, are actually helical stairs.
Built in 1635 and looking distinctly eye-like, these were the first geometric self-supporting spiral staircase in Britain.
The stairs are actually two separate helixes, one leading up and the other leading down, that twist together in a double helix formation.
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