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Rotary Snow Plough Train - not the classic cow-catcher style, this plough more resembles the head of a Tunnel Boring machine. (Skagway, Alaska)

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Nottingham Castle is an earthwork motte and bailey fortress, founded in 1067 by William the Conqueror. In 1170, King Henry II, founded the stone castle, when making the site the principal royal fortress in the Midlands

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This object, found by construction workers, is of unknown origin and found in soil dating to around 7000 BC....or its the end of a nuclear waste depository. Which is more interesting?

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Tunnel Boring Machines. These massive machines are essentially moving factories that cut through the rock, excavate the waste out of the back, and install the concrete shielding, all while pushing itself along like an inchworm.

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from BBC News

'Metal moles' begin work below London

'Voracious worms nibbling their way under London' for the Crossrail project.

A tunnel boring machine that was used at Yucca Mountain nuclear waste repository

from Autoblog

This is how a tunnel boring machine will burrow a viaduct under Seattle

This is how a tunnel boring machine will burrow a viaduct under Seattle - Autoblog

'Bertha', the world's largest tunnel boring machine. She clears a subterranean tunnel that measures 57.5 feet.