The Watson Brake mounds
Hunter-gatherer mounds older than the Egyptian pyramids
Around 3500 BC hunter-gatherers in northern Louisiana raised 11 earthen mounds up to 7.6 m high, joined by ridges into an oval nearly 270 m across. Its 1997 dating pushed North American mound-building back almost 2,000 years and showed that people without farming could manage such works.
Wikipedia (Russian) · Wikipedia (English) · 35th century BC
Meanwhile around the world (±25 years)
Europe
- c. 3500 BC The invention of the wheel — same year