Funny that it is so rare and they offer two names. "Equestrian stairs" is off because of the "stair" part. Plus, the ceiling is so low that a child on a pony would have to duck. "Helical corridor" is more accurate, but odd. When I Google that phrase, I mostly get the Round Tower and some spiral staircases. This one is the Vatican is referred to as "spiral double helix stairs" - beautiful but still stairs and not a ramp. Thanks, @aibolit66!
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