It is characterized by polychrome pottery and rich cemeteries, the most famous of which are Varna Necropolis, the eponymous site, and the Durankulak complex, which comprises the largest prehistoric cemetery in southeastern Europe, with an adjoining coeval Neolithic settlement (published) and an unpublished and incompletely excavated Chalcolithic settlement. 294 graves have been found in the necropolis, many containing sophisticated examples of copper and gold metallurgy, pottery (about 600 pieces, including gold-painted ones), high-quality flint and obsidian blades, beads, and shells. The site was accidentally discovered in October 1972 by excavator operator Raycho Marinov. Research excavation was under the direction of Mihail Lazarov and Ivan Ivanov. About 30% of the estimated necropolis area is still not excavated.