There’s more than one way to build a staircase—not that our local regulators would know about that. (Their motto: “One way and one way only. And do as you’re told.) Anyway, the Curbly blog has what it calls “ten architecturally wondrous staircases,” only a few of which quite meet the description (though they’re pretty cool) and only three of which would be legal in New Zealand. Possibly.
Here’s my favourite few, with a couple of other additions:
More stairs at StairPorn.Org.
PS: Can you pick which one was designed by Frank Lloyd Wright?