October 28, 312★★★★★
Battle of the Milvian Bridge
Constantine defeats Maxentius near Rome; according to tradition he saw a Christian sign before the battle.
WarReligion· Italy
Events this year
Ongoing
c. 5th century BCE – c. 5th century★★★★★
Nazca Lines created
In the desert of southern Peru, the Nazca and earlier cultures create enormous geoglyphs on the ground, best seen in full from above.
CultureArt· Peru
c. 1st century BCE – c. 6th century★★★★★
Teotihuacan flourishes
Teotihuacan in the Valley of Mexico grows into one of the largest cities in the world of its time, with the Pyramid of the Sun and the Avenue of the Dead.
Culture· Mexico
c. 3rd century – c. 9th century★★★★★
Classic period of Maya civilization
Maya city-states such as Tikal, Palenque and Calakmul reach their height in architecture, writing, astronomy and calendrics.
CultureScience· Mexico, Guatemala, Honduras
c. 3rd century – c. 11th century★★★★★
The Ghana Empire in West Africa
The Soninke Ghana Empire (Wagadu) flourished in what is now Mauritania and Mali, growing rich from control of the trans-Saharan gold and salt trade.
DynastyEconomy· Mauritania, Mali