Hidden technology

Throughout time, various cultures have had issues with other cultures. The list of issues is complicated, but suffice to say many cultures have been attacked and their technology as close to destroyed as possible has occurred; reference every single city which has been burned to the ground by a conqueror. It is possible to remove large sections of a conquered cultures technology, but if the conquered culture existed for a very long time with an influence far and wide; reference the Taliban versus Buddhism, the Vatican versus European Polytheistic, reference Catholic priests versus Native American shaman. Removing most traces of their technology becomes impossible. Consequentially reassembling ancient technology becomes a task of detective skills used to reassembling a crime scene. The crime scene would be the murder, attack, burning to the ground a house/building/town/city.

Many ancient cultures had very advanced technology; reference Stonehenge, NewGrange, The Palace at Knossos, The Ziggurat in the city of Babylon. The Northern Europeans pre-Roman invasions for instance had a calendar, when fixed, is so accurate it puts the Gregorian calendar to shame reference Nordic Germanic runic/Elder Futhark half month calendar.

The Cycladic Culture of the Aegean built Knossos. Knossos is a technical marvel.