Lake Pontchartrain Causeway
S9, E37: New Orleans' Lake Pontchartrain Causeway is an engineering marvel: Two ribbons of concrete-at nearly 23.87 and 23.88 miles long each-form the world's longest automobile bridge.

S9, E37: New Orleans' Lake Pontchartrain Causeway is an engineering marvel: Two ribbons of concrete-at nearly 23.87 and 23.88 miles long each-form the world's longest automobile bridge.