Ancient civilizations developed clever solutions to their unique challenges and environments, and learning from those engineers can help us build a greener world today.

MS View of Roman aqueduct / Vers-Pont-du-Gard, Provence ,France

MS View of Roman aqueduct near by river / Vers-Pont-du-Gard, Provence ,France

MS View of Roman aqueduct / Vers-Pont-du-Gard, Provence ,France

MS People walking on bridge / Vers-Pont-du-Gard, Provence ,France

MS People walking on bridge / Vers-Pont-du-Gard, Provence ,France

MS PAN River Thames from South Bank St Pauls Cathedral to gherkin building / London, United Kingdom

WS View river Gardon with Pont du Gard bridge / Pont du Gard, Provence, France

AERIAL MS Traffic on Alexander Hamilton Bridge and Cross Bronx Expressway / New York City, New York, USA

A drive under Moscow's red arch suspension bridge

T/L MS PAN ZI Day turns to night and lights come on, swimmers doing laps in North Sydney Olympic Pool in shadow of Sydney Harbour Bridge / Sydney, New South Wales, Australia

WS People riding paddle boats on river near old town / Prague, Hlavni mesto Praha, Czech Republic

WS Shot of excavator loaded with cement pipe bridge construction site near Saar river / Wiltingen, Rhineland Palatinate, Germany

WS AERIAL View of national theatre and bridge over vitava river / Prague, Czech Republic

Bridge construction site, preparing demolition of old bridge, Saar river, Wiltingen, Germany / Wiltingen, Rhineland Palatinate, Germany

CU AERIAL Shot of top of national theatre / Prague, Czech Republic

MS Side POV LA PAN Shot of river Gardon with Pont du Gard bridge / Pont du Gard, Provence, France

Ardeche Gorge and Le Petit Bois

T/L MS ZO Day turns to night and lights come on swimmers doing laps in North Sydney Olympic Pool in shadow of Sydney Harbour Bridge / Sydney, New South Wales, Australia

T/L WS ZO PAN Evening clouds as day turns to night and lights come on swimmers doing laps in North Sydney Olympic Pool in shadow of Sydney Harbour Bridge / Sydney, New South Wales, Australia

T/L MS ZO Swimmers doing laps in North Sydney Olympic Pool in shadow of Sydney Harbour Bridge / Sydney, New South Wales, Australia

T/L WS Pont au Change of Palais de Justice and Conciergerie, Paris, France

Bridge in Paris, winter

Old bridge in the spelunca canyon on corsica, france,