c. 3138 BC Ljubljana Marshes Wheel is a wooden wheel that was found in the Ljubljana Marshes in Slovenia. Radiocarbon dating showed that it is approximately 5,150 years old, which makes it the oldest wooden wheel yet discovered.
c. 3100 BC start of the reign of Hor-Aha, second pharaoh of the 1st Dynasty
Varna Necropolis: what have been claimed to be the earliest-known worked gold artifacts are manufactured.
Malta: Construction of the Ħaġar Qim megalithic temples, featuring both solar and lunar alignments. "Tarxien period" of megalithic temple construction reaches its apex.