In contemporary history, the third millennium of the anno Domini or Common Era in the Gregorian calendar is the current millennium spanning the years 2001 to 3000 (21st to 30th centuries).
Building of the Great Pyramid of Giza (26th century BC). Sails used on ships (20th century BC). First ziggurats built in Sumer. Near East civilizations enter Bronze Age around 3000 BC. Oldest known medicine wheel constructed in the Americas. First Copper (~2500 BC) and then Bronze (~2000 BC) and other types of metallurgy are introduced to Ireland.