The Longyou Caves were only discovered late in the 20th century. At least 24 caves have been discovered so far. All of which were carved by hand. Although the overall excavation involved almost a million cubic metres of stone, there is no historical record of them or evidence of the work. Their origin is a complete mystery. At present there is no explanation for their existence. They represent one of the largest underground excavations of ancient times.:
The Olmecs are a mysterious culture considered by many as the Mother Civilization of Mesoamerica. Archaeological sources believe their civilization began around 1250 BC. However, there are also opinions that it is much older, and its origins date back to 3113 BC, when god Quetzalcoatl arrived to the region. While others suggest the Olmecs originally came from Africa and introduced a calendar, writing, pyramid and tomb construction, mummification, and religious traditions to the native…
The Lomas Rishi Cave on Barabar Hill. The Barabar Caves are the oldest surviving rock-cut caves in India, mostly dating from the Mauryan period, and some with Ashokan inscriptions, located in the Bela Ganj Block of Gaya District of Bihar, India, 24 km north of Gaya.
They seemed to be several hundred years old except for one particular sample taken from the Kongpo structure in Tibet (in the vicinity of Lhasa). This one was in fact much older. Why did possible knowledge of the mysterious tall star-shaped structures disappear? Built mostly of the cut-stone and timber, the Tibetan towers have some unusual characteristics. Some over forty of them have eight points and some others have twelve which is yet another mystery of them.
25,000 Year Old Buildings Found In Russia |The Caucasian dolmens represent a unique type of prehistoric architecture, built with precisely dressed large stone blocks. The stones were, for example, shaped into 90-degree angles, to be used as corners or were curved to make a circle.