Philosophy of thought
historynet:

The condensation trails from German and British fighter planes engaged in an aerial battle appear in the sky over Kent, along the southeastern coast of England, on September 3, 1940. [1247x788]
historynet:

Body of frozen Soviet soldier propped up by Finnish fighters to intimidate Soviet troops, 1939 [900x1145] (x-post r/military)
historynet:

Headman’s axe and block, Tower of London. 1910 [1402x1536]