This 2017 episode covers Great Zimbabwe, a massive stone city in southeastern Africa that was a thriving trade center from the 11th to 15th centuries. When Europeans learned of it in the 16th century, they were certain it wasn't African at all.

Robert Moses and the Shaping of New York, Part 2
42:12

Robert Moses and the Shaping of New York, Part 1
41:59

SYMHC Classics: Eradication of Smallpox
43:25