Fodor's Expert Review Forth Bridge

Opened in 1890, when it was hailed as the eighth wonder of the world, this iconic red cantilevered rail bridge is a UNESCO World Heritage site. The extraordinary, 1½-mile-long crossing expands by another yard or so on a hot summer's day. The famous 19th-century bridge has since been joined by two neighbors; the 20th-century Forth Road Bridge (opened 1964) and the 21st-century Queensferry Crossing (opened 2017).