THE LEGEND OF AKAKOR.

In 1973, Erick von Daniken, at the height of his fame, claimed in his book "The Gold of the Gods" that he had found a gigantic subterranean tunnel system. The Gods came from a different solar system and built an underground tunnel system that connected a series of fortresses and cities.
The story that brought von Daniken to South America began in the Brazilian town of Manaus. There, on March 3, 1972, a German foreign correspondent Karl Brugger met a local Amazonian Indian, Tatunca Nara,  that resulted in Brugger's book "The Chronicle of Akakor," published in 1976.
The number of foreign editions made at that time ended up in the creation of the legend of Akakor, a mythical town somewhere deep within the Amazonian jungle, still left to be discovered.
The title of the book was the same title used by the Amazonian tribe Ugha Mogulala's chronicle held sacred, or at least central, to their mythology and philosophy. The core message of the Chronicle was the statement that there were a network of tunnels, some of them still in existence today and used by the locals.
The local Amazonian Indian, Tatunca Nara claimed to be a member of this Amazonian tribe, the son of a native and the daughter of a German missionary, which was suppose to account for his impeccable German.
Tatunca Nara claimed that the Year Zero of the Chronicle was 10,841 BC. The time was very much outside of the framing time accepted by archaeological dates for human occupation  of the Amazon at the time. But it perfectly matched in the "Atlantis and Deluge" theory that many alternative researchers favored, due to the already popular spiritualist Edgar Cayce.
The best evidence in favor of the Chronicle would be to discover any of the thirteen underground cities, which this civilization left behind in the Amazon jungle. Their most important ancient towns were said to be known as Akakor, Akanis, and Akahim, as well as Cuzco and Macchu Picchu.
Tatunca Nara added that the first place named Akanis, was built on a narrow isthmus at a place where the two oceans met together. The second place was Akakor, far up towards the Purus River, in a high valley in the mountains of the border between Brazil and Peru. The whole city was surrounded by a high stone wall with 13 gates that were so narrow that they permitted access only to one person a time. The city had a Great Temple of the Sun, it contained documents, such as maps and drawings telling the history of the Earth. The third place was Akahim that was linked with Akakor, and was situated on the borders of Brazil and Venezuela. Finally Cuzco and Macchu Picchu were known to be genuine towns known as far back 1,000 BC.
All these fortified cities were completely destroyed in the first Great Catastrophe thirteen years after the departure of the Gods, leaving very little to check on the ground for foreigners.
The legend of Akakor received an entirely new dimension when Karl Brugger was murdered when he was leaving a restaurant in Rio de Janeiro on January 1, 1984. Some have queried whether his murder had anything to do with his book and/or knowledge of the tunneled fortresses.
Since the 1970s, the Amazon has become much more open to the world. Akakor, however, remains undiscovered. After Brugger, several other people went into the jungle, apparently all enthralled by the legend of Akakor, trying to be the discoverer of this mythical city.
Today the tunnels still in existence are known only by the locals who still preserve their use for sacred rituals.