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The first inhabited areas in what is now Bulgaria were the caves along the lower reaches of the rivers Iskar, Yantra and Rusenski Lom. By the 6th century BC, the most developed settlement network was Thracian. Later, under the impetus of mining, stock-breeding, and agriculture, settlements grew up in the Rhodopes, the Balkan Mountains, the Sofia area, the Vratsa area, and elsewhere.
At the beginning of the 4th century BC, there were about 3,000 settlements on the land that is now Bulgaria. In the 3rd century BC the first stone fortresses were built.
Until the end of the 2nd century BC, settlement development continued to reflect Thracian cultural influence. Sofia (Serdika), Plovdiv (Pulpudeva), Yambol (Kabile), Stara Zagora (Vereya), Kyustendil (Pautaliya), Blagoevgrad, among other places, were all established as Thracian settlements.
In the 8th century BC, the first Greek cities were founded as colonies (apoiki) in Aegean Thrace, and by the 7th century BC most of our Black Sea settlements were already established – Varna (Odesos), Sozopol (Apolonia), Pomorie (Anhialo), Tsarevo (Vasiliko), Nesebar (Mesembria), and others.
Things to do in Sofia:
have a look at the getyourguide website, to find out the ways you can spend your time there.