@publicvoit Charles Bridge (Karlův most), across the Vltava (Moldau) river in Prague, Czech Republic, construction animation, showing medieval engineering techniques.
This video is the longer-form (3m), higher-quality version of a gif circulating earlier (see parent).
Background on the bridge:
Article (in Czech); http://praha-archeologicka.cz/p/212
HN discussion: https://news.ycombinator.com/item?id=24798302
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