The artifacts that fell into the hands of scientists give reason to say that many time ago, other developed civilizations lived on planet Earth, which everyone has now forgotten about.
Lens of Nimrud from the capital of Assyria
Ancient civilizations knew much more and were much better developed than researchers thought 20 years ago. Archaeologists have found a number of ancient devices - from planispheres to similar batteries. The most famous is the Nimrud lens.
The lens of Nimrud, which is believed to be 3,000 years old, was found during excavations in the ancient Assyrian capital of Nimrud. There are scientists who suggest that the lens is part of an ancient Babylonian telescope. From which it can be concluded that they had advanced knowledge in astronomy.
(You can read more about this artifact here: The Oldest Lens in the World)
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Evidence for the existence of the ancient Indian empire of Rama
For a long time it was believed that the Indian civilization appeared only in 500 BC. But the discoveries that were made in the last century were able to postpone the emergence of Indian civilization by several thousand years.
In the Indus Valley, they found the cities of Harappa and Mohenjo-Daro, ideally planned even if you understand by modern criteria. Harappa culture is also a mystery. Its roots are hidden for centuries, and scientists have not yet been able to figure out the language. No buildings were found in the city that would indicate differences in social classes, and there were no temples or other places of worship. Moreover, it should be noted that in no other culture, including Egypt and Mesopotamia, the level of city planning was not so high.
Nan Madol
On an artificial archipelago in Micronesia not far from about. Pohnpei are the ruins of the ancient prehistoric city of Nan Madol. The city is built on a coral reef made of basalt boulders, sometimes weighing up to 50 tons. The city is crossed by a large number of canals and underwater tunnels, and its streets are partially flooded. In scale, this city is comparable to the Great Wall of China or the Egyptian pyramids. And it is completely unclear by whom the city was built and when it was built.
Megalithic ruins of Puma Punku and Tiwanaku
Puma Punku is a megalithic complex near the ancient pre-Inca town of Tiwanaku in South America. The age of the megalithic ruins is controversial, but researchers are unanimous that they are more old than the pyramids. About 15,000 years old.
Heavy stones that are used in construction, cut and fitted to each other so perfectly that there is no doubt that the one who built this clearly had developed knowledge of cutting stones, geometry and they had the tools that would allow them to do this. The city still had a functioning irrigation system, sewerage system and hydraulic mechanisms.