Time Team: Forty metres long and ten metres high, this ten-arch stone construction had been built back in 1790 to carry coal to the new Blaenafon blast furnaces, which were at the forefront of the Industrial Revolution in Wales. Yet within 25 years of it being built, it had 'disappeared' from the landscape. There was no record of it having been demolished - so where had it gone?

Starring:

Carenza Lewis, Henry Chapman, Ian Powlesland, John Gater, Mick Aston, Phil Harding, Stewart Ainsworth, Tony Robinson, Victor Ambrus

Genre:

Documentary, History