Polish megaliths date to 6500 BCE, making them Europe's oldest massive stone structures and observatories. Slavs, Veneti, and Sarmatians genetically persisted unchanged in Central-Eastern Europe. Oldest known modern horseman lived in Pannonia plain, predating Kazakh steppe herders by 1000 years. Next oldest riders traversed Wallachia and Bulgarian coasts. Goths from Scandinavia bypassed and abandoned core Western Slavic lands between Elbe, Vistula, and middle Danube. Scythian-style mercenaries defending Greek colony had Balto-Slavic and Sarmatian genes. Silesian megalith circles dwarf Stonehenge in size and age by double and 1000 years, dating to 5500 years ago. R1a haplogroup spread across Central Europe in 3rd millennium BCE with earlier presence in Ukraine, Moldova, and Russia back to 11,000 BCE. Etruscans carried strong Central European steppe Indo-European genetics, altered only during Roman Empire. Aryan civilization roots challenge steppe origin theory.