How does the author introduce the hidden prehistoric city ion the jungle

He describes how a prehistoric city would have been like.

Explanation:

The text you're referring to is "Secrets of the Lost City of Z" by Anthony Mason. In this writing, the author talks about Arthur Conan Doyle's book "The Lost World", and how this story influenced other ideas such as Jurassic Park and King Kong. However, the focus of the text is the main character, Col. Percy Harrison Fawcett and his search for the Lost City of Z, somewhere in the middle of the Amazon rainforest. In the introduction of the text, the author wrote,  

"Since the dawn of the modern age, the notion of a pre-historic world, hidden deep in the jungle and untouched by the passage of time, has captived our imagination."

the answer is:

magna carta