Trying to comprehend the improbable is hard enough. Taking it to a different level would be trying to understand the impossible. The known level of technology in the mid-18th century is refusing to support advanced engineering presented on the below Piranesi engravings.
Piranesi's engravings...
Giovanni Battista Piranesi (4 October 1720 – 9 November 1778) was an Italian artist famous for his etchings of Rome and of fictitious and atmospheric "prisons" (Le Carceri d'Invenzione). He was a so called Cappricio artist.
In other words, contemporary interpretation of his creations is that it...