Examining a ghost island that once belonged to one a secretive country on the fringes of Europe. Also, a haunting site in the UK with evidence of strange burial practices, crumbling Caribbean ruins, and a sleeping industrial giant born from the ashes of America's most divisive war.

A complex of stone building near Hadrian's Wall that were built to keep Northern hoards at bay! Also, a top secret military facility in the American Midwest, A series of vast structures in Lithuania and a collection of decaying locomotives in the heart of Ethiopia.