The Lost City of Z is the name given by Col. Percy Harrison Fawcett, a British surveyor of the early 20th Century, to an indigenous city that he believed had existed in the jungle of the Mato Grosso state of Brazil. Based on early histories of South America and his own explorations of the Amazon River region, Fawcett theorized that a complex civilization once existed there, and that isolated ruins may have survived.[1]