Building a Bridge in the 14th Century

The historic Charles Bridge in Prague, Czech Republic, was built over the Vltava River. Construction began in 1357 and continued for around 50 years. How did they build such a large and sturdy bridge back then? This video from Engineering and architecture gives us a ridiculously quick idea of what was involved in the bridge construction. We can only hope the engineers and laborers alike were adequately compensated. (via TYWKIWDBI)