Scientists still are mysteries of the history, which can not give a logical explanation.
The first stone calendar.
In the Sahara Desert in Egypt are the oldest known astronomically aligned stones in the world: Nabta (Nabta). For a thousand years before Stonehenge, people built a stone circle and other structures on the lake, which has long dried up. More than 6,000 years ago, stone slabs three meters high was dragged over a kilometer to create this place. Pictured rocks - only part of the entire complex, which has been preserved. Although currently the Egyptian Western Desert completely dry, it was not so in the past. There is good evidence that in the past there were a few wet cycles (when up to 500 mm of precipitation falls during the year). The most recent refers to the interglacial period and the start of the last glaciation, it was about 130,000 to 70,000 years ago. During this period, the region was a savannah and support the lives of many animals, such as bison and the extinct big giraffes, antelopes and gazelles different species. From about the 10th century BC, this area became the Nubian desert to get more rain, filling the lake. Early humans may have region attracted sources of drinking water. Archaeological findings may indicate that human activity in the area is known, at least somewhere in the 10th and the 8th millennium BC.
Chinese mosaic of lines.
These strange lines are at coordinates 40 ° 27'28 .56 «N, 93 ° 23'34 .42» E. There is not much information available about this "strange" but beautiful mosaic of lines does exist, it carved in the desert province of Gansu Sheng in China. Some records indicate that the "lines" were created in 2004, but nothing officially confirm this assumption seems to have been found. It should be noted that these lines are located near the Mogao Grottoes, which is a World Heritage Site. Lines are drawn on a very long distance, and at the same time retain their proportions, despite the curvature of the terrain.
Unexplained stone doll.
In July 1889 in Boise, Idaho, found a small human figure during the operation to drilling. The find sparked intense scientific interest in the last century. Unmistakably made by human hands, "doll" was discovered at a depth of 320 feet, which allowed to carry her age at the time, far from the arrival of man in this part of the world. The find has never been challenged, but only to say that this is, in principle, impossible.
Iron bolt, age 300 million years.
He was found almost by accident. Expedition Center "MAI-Kosmopoisk" engaged in search of fragments of the meteorite in the south of the Kaluga Region, Russia. Dmitry Kurkov decided to look normal, seemingly, a piece of stone. What he found, can overturn our understanding of earth and space history. When a stone brushed the dirt on its cleavage was clearly visible somehow got inside ... bolt! Length of about an inch. How did he get there? Bolt with a nut on the end (or - what this thing looked like too - reel to the rod and two discs) sitting tight. So, got into the stone back in the days when he was a sedimentary rock, clay bottom.
Ancient rocket ship.