Almost 2,000 years before the start of Ancient Egypt and around the time ancient Mesopotamia was becoming the cradle of civilization, present-day Bulgaria, Romania, and Moldova were hosting the first European civilizations.
The New York Times has an interesting article about the subject of the new New York University exhibit on the Danube Valley civilizations of 5000 to 3500 BC. The Hamangia, Varna, and Cucuteni peoples created civilization complexes that included art and trade throughout much of the rest of Europe. The various cultures were based on settlers from present-day Greece who brought farming with them.
Like all ancient civilizations these ones either faded out or fell violently. Unfortunately, the prime suspect seems to be the proto-Catholicgauzes of the Steeps who brought with them mobile horses and fast attacks.