How It s Made: Spiral Stairs

Spiral stairs were once part of a strategy to defend the towers of medieval castles. See how they re made today! Stream Full Episodes of How It s Made: https://www.sciencechannel.com/tv-shows/how-its-made/ Subscribe to Science Channel: http://bit.ly/SubscribeScience Like us on Facebook: https://www.facebook.com/ScienceChannel Follow us on Twitter: https://twitter.com/ScienceChannel Follow us on Instagram: https://www.instagram.com/ScienceChannel/