In partnership with Tianderah Private Foundation, American Foundation for Bulgaria has supported Provadia Salt Mines Archaeology Study Project.

A team of Bulgarian and foreign historians, lead by Prof. Vasil Nikolov, has been reasearching the site of the salt mines at the town of Provadia. There is a tomb, dating back to pre-historic times 8 000 B.C., which the archaeologists excavate since 2006. In their research, they have discovered a well established civilazation, based on highly developed, and efective tëchnology of production of salt. The world scientific community refer the site as the Europe's oldest pre-historic town.