54 (c) Ancient Ancestors (Just for Fun)
There are a growing number of people that suspect our current civilization of not being at the all-time pinnacle of technological development. The most well-known example would be the legend of Atlantis. I know of no evidence (circumstantial or otherwise) that validates the location of this alleged advanced empire. However, there are numerous examples of ancient locations of advanced civilizations that contain direct evidence of building techniques that would be very difficult to replicate with our current technology and in some cases current replication would be impossible.
While there are many examples, following are just a few that are both amazing and difficult, if not impossible, to explain:
Baalbek, Eastern Lebanon The largest cut stone block found in the entire world is located here. Weighing an estimated 1200 tons, it is 69 feet by 16 feet by 13 feet 10 inches, making it the single largest piece of stonework ever crafted in the world. The date of the original construction is circa 7,000 BCE.
Three other stones weighing an estimated 800 tons each, have been lifted and placed to form one of the retaining walls at the site (see link above). It has been pointed out that this site was occupied at a later date by the romans and that they had cranes capable of lifting as much as 5 tons. It would take about 160 cranes to lift and place a 800 ton stone. Does this seem reasonable? http://www.ancient-origins.net/ancient-places-asia/monumental-baalbek-largest-building-blocks-earth-00656
Puma Punku (or Puma Pumku) Is a mysterious site located in Bolivia, has astounded archaeologists. It is part of a larger archaeological complex known as Tiahuanacu, and is considered to be one of the most important sites of Andean history. The estimated date of the site, based on circumstantial evidence only, is circa 12,000 BCE. http://www.ancient-code.com/12-facts-about-puma-punku/
The precision cutting of the stones at this site can only be accomplished today using laser technology. http://www.unacknowledged.info/puma-punku/