Building of Stonehenge
A Neolithic sanctuary aligned with the solstice sun

Neolithic Britons began a circular sanctuary on Salisbury Plain, raising its giant sarsen stones around 2500 BC. Aligned with the solstice sunrise and sunset, it is the most famous prehistoric monument in Europe.
Wikipedia (Russian) · Wikipedia (English) · 31st century BC
Did you know
Göbekli Tepe was built around 9500 BC, 6,500 years before Stonehenge. More time separates them than separates Stonehenge from us.
Meanwhile around the world (±25 years)
Africa
- c. 3000 BC End of the Green Sahara — same year