From what we now know of Hindu cosmological time cycles, human civilization must be far older and its secrets more profound than what is generally inferred from the available historical and archaeological evidence.
History is a story of man's past built up out of written records and dates. Archaeology lays a foundation where history leaves off. But archaeology makes its greatest contribution in places no longer suitable for human habitation. In places of continued human habitation time quickly lays waste to bricks and mortar, metals are melted down and recast, and any object which is of use is reused or made into something else which is then used. Archaeology will not serve us here. And yet, in these places of continued human habitation, man's deepest past lies hidden. To see this deep past of mankind we must look in a different way. Nowhere today are the traditions older than in the living civilization of India. The methodology of the spiritual aspirant may well be more successful here than that of the scientist, the historian or the archaeologist.
To anyone who would work along similar lines, I would advise that you let go of prejudice and skepticism and enter in with an open mind. As Henry David Thoreau, the nineteenth century American transcendentalist philosopher and an enlightened student of the Vedas, once said,