From gravity-defying viaducts to simple-yet-sturdy Roman stone arches, the world’s bridges come in all shapes and sizes and have linked towns and cities through the ages. Some of these manmade wonders ...

The Lake Pontchartrain Causeway connecting Metairie and Mandeville is among the world's longest bridges, a fact that many of its commuters are likely acutely aware of when they glance out across miles ...