Forth Bridge

Steel cantilever railway bridge, completed 1890. Designed by Sir John Fowler and Sir Benjamin Baker and built by William Arrol of Glasgow across the Firth of Forth near Edinburgh. No bridge shows its forces more honestly. Each of the three great diamond-shaped towers is a pair of balanced arms reaching out from its pier, with the fat tubes pushing and the slender lattice ties pulling, and short suspended spans dropped in between. It is 2.5 kilometers long and 110 meters high, held the record for the longest cantilever span for 27 years and became a UNESCO World Heritage Site on July 5, 2015. Take the train over it, then go down to South Queensferry to see it with its two modern road bridges alongside.