All are free (public domain, GFDL, or similar) since I'm skeptical of fair use:
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Seraphim surrounding the divine throne, from a 14th-century illuminated manuscript
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French shallots
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Justus Lipsius's edition of Tacitus
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A quinarius (from it:)
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The Orangerieschloss in Potsdam (pinched from de:)
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Charles-Francois Daubigny (found via fr:)
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Eliphas Levi (found via fr:)
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Adonis (from fr:)
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Miners register their claims during the Klondike Gold Rush
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Climbing the Chilkoot Pass
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Miner's camp at the head of the Yukon River
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Gold mining during the Klondike Gold Rush
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Hudson Bay Company post on Lake Winnipeg
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Shahadah (cropped from the flag of Saudi Arabia)
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Trebuchet (pinched from fr:)
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Trebuchet (pinched from fr:)
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Shield of the Midi-Pyrenees (from fr:)
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Charge of the Huns
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The Feast of Attila (my favorite of those I've found)
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My eyes
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The Meeting between Leo the Great and Attila