> with no safety barriers

A guardrail isn't a safety barrier? The photos of the staircase don't look like star wars walkways to me at all.

Ahhh.... I couldn't figure out why they said that. I forgot the Statue of Liberty had double-helix staircases.

We call them “spiral staircases” yet rarely do they actually contain a single spiral - but they do have a helix. I guess “helical staircase” was just too much for people to care about as the term embedded in the 1600s. Previously they’d been winding stairs, screw stairs, and earlier yet just a “vice”, so common were they. Weird how language adapts to what’s easy rather than what’s correct.