They are said to celebrate some of Scotland's major and most recognisable engineering achievements and "symbolise solidity, stability and continuity".

BBC: NEWS | UK | Scotland | Glasgow, Lanarkshire and West | Rail bridge builder on ?20 notes

Google snapped up Keyhole in 2004 and turned it into Google Earth, one of the great Web engineering achievements of our time.

FORBES: The Niantic Project: What Is Google Up To?

We're inviting nominations for a new kind of international engineering prize - one that will consider achievements in all areas from fashion to fusion and from telescopes to televisions.

BBC: Viewpoint: UK economic future 'depends on engineers'