The River Thames at London is the most-bridged river in any major city.
Yet for more than 1,600 years, London had only one bridge.
Why did this happen and what effect did it have? ..... find out >

The Firth of Forth posed a challenge to the engineers of the 19th century — how to make a reliable and secure crossing over it. It wasn't until the idea of a cantilever bridge came along that the problem was solved.
Why was a cantilever the right solution? ..... find out >