The oldest salt production and urban centre in Europe, Provadia-Solnitsata, is open for visitors until the end of September. It is open from Monday to Saturday, from 9.00 am to 13.00 pm. The tour starts every round hour at at 9:00 am, 10:00 am, 11:00 am, 12:00 pm and 13:00 pm respectively. A photo exhibition features the latest discoveries in the prehistoric complex. It highlights the achievements of military theory and the art of construction typical of the prehistoric settlement.

The extraction of the strategic raw material turned Provadia-Solnitsata into Europe's first "mint" and most ancient urban centre, which impressed with its trade ties and social hierarchy from 5,600 BC to 4,350 BC.

"The people who inhabited the lands near present-day Provadia held the salt monopoly over a vast region - from the Carpathian Mountains to the Aegean Sea and from the Black Sea to the Central Balkans," said Academician Vassil Nikolov, head of the archaeological team in Provadia.

In his words, Bulgaria is among the three European countries with the greatest number and variety of archaeological monuments. Few countries in the world have such a rich history,. Provadia-Solnitsata is a site that generates high scientific and public interest and deserves to be developed and recognized in Europe - said Academician Nikolov. In October, the exhibition will be presented at the European Parliament in Brussels.