Lake Pontchartrain Causeway, USA-At just under 24 miles, this one goes deep into water world.Photo: Joe Shlabotnik Photo 4 of 16 in World’s Most Impressive Bridges by Hal Amen

World’s Most Impressive Bridges

4 of 16

Lake Pontchartrain Causeway, USA-At just under 24 miles, this one goes deep into water world.Photo: Joe Shlabotnik