Inside the structure are a few rooms with pieces of old, rusting equipment lying around.

A model of Welthauptstadt Germania.

Vehicles would have instead been diverted into an underground highway running directly underneath the parade route.

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Its dimensions were so large that it would have dwarfed every other structure in Berlin.

Had it been built, it would been the largest enclosed space in the world.

Model of the Groe Halle and the Volkshalle.

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Such cultism was at the root of the entire plan.

Model of the Volkshalle at the Berlin Underworld Museum in Berlin.

Photo credit: Thomas Peter/Reuters

There was, however, a problem.

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If the structure sank less than 6 cm, the soil would be deemed sound.

The concrete body sank 19 cm.

A few months later the Second World War began and all plans for Berlin had to shelved.

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Photo credit:Jurjen van Enter/Flickr

Inside the Schwerbelastungskoerper today.

Photo credit:Paul Horsefield/Flickr

Inside the Schwerbelastungskoerper today.

Right below the Brandenburg Gate on the same scale.

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Photo credit:picture-alliance / dpa

Model of Welthauptstadt Germania at the Berlin Underworld Museum in Berlin.

Photo credit:KaterBegemot/Wikimedia

Model of Welthauptstadt Germania at the Berlin Underworld Museum in Berlin.

Seen here is the Arch of Triumph.

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Photo credit:www.pressestelle.tu-berlin.de

Sources:Schwerbelastungskorper (Wikipedia)/Welthauptstadt Germania (Wikipedia)/Volkshalle (Wikipedia)/skyscraperpage.com/AndBerlin

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