Ingenuity of medieval people is underestimated!
— Aristocratic Fury (@LandsknechtPike) September 10, 2022
Reminder that in 15th century the Teutonic Knights were able to heat this large hall in Marienburg castle from 6°C to 22.5°C in just 20 minutes.
They used an elaborate hypocaust heating system!
Find out how! Short thread.🧵 pic.twitter.com/ZLLNIyp5mo
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