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In this episode, concrete channels hidden in a mountaintop forest, a collapsing bridge, a marooned military base and the upright rusting carcass of ship - but why have they all been abandoned?
An abandoned Soviet prison and forced labour camp submerged beneath the water, the eerie remains of a tunnel leading deep into the heart of Blue Ridge Mountains, strange concrete towers hidden away in Finland's snow-covered countryside, and a colossal rusting relic standing proud on the coast of southern Spain.
The towering remains of a mountainside structure with an explosive past…a deserted and disintegrating cityscape in the heart of Detroit…a former top-secret Soviet facility still shrouded in mystery off the coast of Estonia…a strange hulking mass of concrete lost in the Polish countryside.
Returning exclusively on Yesterday, the brilliant series the uncovers the history of strange and seemingly out-of-place buildings and structures. What were these once impressive constructions? Who built them and why? And why were they abandoned?