The underground city was built on 13 levels, with about 15 000 ventilation shafts located underground, allowing air to reach even the deepest levels.
Throughout the Incan city are 16 fountains, which residents once obtained water from. It was not spring water - it was brought to the city via a unique system of engineering.
Every time we hear about ancient civilizations in America, most of us immediately think of the Aztecs, Mayans and Incas. A little known fact is that these were neither the greatest, nor the oldest cultures to rule the exotic lands of Latin America.
No tourist that ever visits Jericho today, with its 20 000 residents, would be able to believe that it was once the largest city in the world. Researchers are convinced that the Palestinian city was the 1st city built by humans about 11 000 years ago.
In the 40s of the 20th century in the desert around Shahdad, Kerman Province in Iran, archaeologists came upon a mysterious village. The settlement, which bears the name Makhunik, was once home to an ancient civilization of dwarves.
The Annunaki were tall humanoid beings that were incredibly long-lived - living on average about 350 000 Earthly years. Male Annunaki reached heights of up to 16. 5 ft (5 m) and females - up to 13 ft (4 m).
The shock was utter and complete when carbon dating of the ruins showed that these cities had sunken beneath the waves thousands of years ago, when according to archaeologists cities had not yet existed.
Even though few people today know of the existence and location of the city of Nimrud, at one point in time, nearly 3000 years ago, it served as the capital of the known world.
The first city, known as Tamchen, contains plazas, palace-like structures and a 49 ft (15 m) pyramid. The second city is called Lagunita. American researcher Eric Von Euw was the first to document this site 40 years ago.
The remains of numerous ancient cities provoke the human imagination because of the mysteries surrounding them. There are cities that no one knows how they were built and how they came to be, even to this day.