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Watch Abandoned Engineering Season 14 Episode 4 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

In El Paso Texas, two ornate buildings once at the heart of the Mexican Revolution, still bear the scars of a deadly battle. A top-secret facility outside Berlin, used by a ruthless dictator to escape justice. In County Carlow, Ireland, an aristocratic party palace transformed into a military base, used by members of the IRA's all-female paramilitary wing. And a picture-perfect town in Spain where the residents were forced to evacuate on the orders of an authoritarian regime.