Bronze Age Culture of Gojoseon
Mandolin-shaped bronze daggers, table-type dolmens and Misong-ri pottery spread across Liaoning and northern Korea, tracing the reach of Gojoseon.

Prof. Gary Lee Todd · CC BY-SA 4.0 · Source
The Bronze Age brought rice farming, private property and social rank. Dolmens, the tombs of the elite, show rulers able to mobilize many people to move their capstones. Korea holds nearly half the world’s dolmens; the Gochang, Hwasun and Ganghwa sites became World Heritage in 2000.
The mandolin-shaped dagger later gave way to the slender Korean dagger, and stone moulds show they were cast locally.