are so exceptional and extraordinary,
even by today's standards,
extraterrestrial beings are becoming
increasingly difficult to rule out.
Derinkuyu: Ancient Underground City
The subterranean city of Derinkuyu was unveiled in Turkey during the 1960's by chance when a present-day home was being renovated above the surface.
The 18-story city beneath the ground is the largest of hundreds of kinds like it constructed by mystery men around the eighth century B.C.
The completion of the city is comparable to digging out a system of below ground chambers inhabitable for 20,000 people with just a hammer and chisel. It is suspected the city was used as a huge bunker to protect its occupants from possible natural disaster or war.
Amazingly, the community had accessible fresh water, shops, individual rooms, community rooms, tombs, escape routes, arsenals, livestock, and even a school sporting a study room.
Hypogeum of Hal-Saflieni: Bizzare Acoustic Complex
A prehistoric, below grown, three-level, stone monument on the island of Malta is known as the Hypogeum of Hal-Saflieni and was uncovered in 1902.
Finding it was an accident: several laborers fell through a hole they were digging.
In addition, 7,000 skeletal remains were discovered. Unbeknownst to anyone is the time period Hypogeum of Hal-Saflieni was built, but it is made completely from megalithic stones.
To make matters even more strange, voices in the range 95 to 120 Hz can echo throughout the whole complex when a person is standing in a certain spot.
Essentially this means that women's voices often don't produce this effect in the same way that men's voices do.
If that's not strange enough, a man with a voice range at about 110 Hz, the whole dwelling becomes a room that induces trance-like states and appears to be able to stimulate the creative center of the human brain.
The Ancient Marib Dam: Great Dam
In 750 B.C. the Sabeans constructed a great dam in the dehydrated, hot, and arid country of Yemen.
The dam was once close to being one of the Seven Wonders of the World and remained intact for over 1,000 years, in comparison to modern day dams that last for roughly 50 to 100 years.
Around 2,000 feet long, the Great Dam of Marib was almost twice as long as the Hoover Dam.
In about 600 A.D, the dam collapsed and burst, ruining most of the agriculture system and turning the area into the sandy spot it can be seen as today.
Puma-Punku: Perfect Stone City
Also strange, the biggest of the stones is 25 feet long and 17 feet wide, estimated to weigh around 130 tons. How did these people move these colossal rocks without technologies such as cranes?
And their placement of the stones was foolproof and abstract.
Gobekli Tepe: Oldest Human Construction
A covered, ancient complex made from giant stone pillars organized in a circle, 6,000 years older than Stonehenge was discovered in the 1960's by surveyors in Turkey.
The huge, abstract, limestone pillars were carefully chiseled from a close-by quarry using wedges of flint and bare human hands.
This is amazing, especially considering the complex is estimated to have originated in around 9000 B.C. Gobleki Tepe is regarded by some to be the oldest human construction.
The area even precedes agriculture.
This means that the people were still hunting animals for food instead of planting crops, which doesn't make a lot of sense because we are told and believe today that humans did not begin to construct things until after farming was learned.