Building a bridge over water is a daunting task, and despite the many technological progresses, the basics have remain unchanged since ancient times. First a cofferdam is constructed on the riverbed and the water inside this enclosed structure is pumped out, exposing the muddy button. Upon this ground the piers of the bridge are erected.
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The historic Charles Bridge in Prague. Photo: Adisa/Shutterstock.com
Source: amusingplanet.com