U&Eden +1 Thursday

A seemingly endless concrete line stretching through the French countryside, which sits as a monument to a discarded engineering advancement

A little-known dark past explains the vast monolithic structures that dominate the small island of Guernsey

Projects include a maze of tunnels filled with haunting remains beneath the streets of Paris and a strange formation of domed structures hovering over the waters off Florida

A village ruin that is now pitted and scarred, a ghostly fleet of ships, a bridge to nowhere hidden in a forest and strange metal structures in a wood

An eerie, empty country village which hides a sad secret, a mysterious tower battered by the elements and a disused railway deep beneath the streets of a city

A settlement in Argentina destroyed by floods, a town in the US that has been erased, and a Soviet dream-town that turned into a nuclear nightmare

Michael Portillo travels from Stroud to Bath, investigating the Victorian origins of snooker, before stopping in Cirencester, then taking tea with the ladies at his end destination