This double spiral staircase.

Image from preview.redd.it and submitted by hawaiiinsomniac
image showing This double spiral staircase.

TheTravelingSalesGuy on April 1st, 2019 at 13:08 UTC »

I would be walking up these and there would be a person coming down and in my confusion I would slip and fall to my death.

Cyanopicacooki on April 1st, 2019 at 13:17 UTC »

Spiral staircases are the DNA of old castles, and this one is undergoing mitosis.

singingnettle on April 1st, 2019 at 14:17 UTC »

Edit: There are saftey precautions there and here's the video. I shot it on my phone which has bad image stabilisation but I hope it satisfies. Shoutout to my boys at r/aeiou

This is located in Graz, Austria. Here's a collection of pics on wikipedia.

It looks stupidly dangerous by modern standards but keep in mind it was constructed sometime in the late 1400s / early 1500s. It's accessible to the public but it doesn't actually lead anywhere apart from a couple of locked doors, so it's not heavily used and when it is, it's solely for the novelty

Edit: if anyone's interested I'll go past after work and film the staircase to help visualise it