A picture is worth a thousand words, but not all pictures are created equal.  We should warn our readers that some of these pictures may upset them, while others may fill them with joy.

But that’s precisely because these images reflect some of the best and worst parts of the human experience and world events.

Some of these photographs may mean more to some of our readers than to others.

But hopefully, they will remind us all that the world can always use a little bit more love, tolerance, compassion and understanding.

Attention history teachers everywhere: If you want to wake those sleeping “kids”, show them these 18 rare photos from the past.

Yes, they could get a thousand words from the textbook, but wouldn’t you rather engage them with these historical photos?

1. Inside an Auschwitz gas chamber

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2. He stood alone, refusing to join the Nazi salute in 1936. 

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3. “Wait For Me Daddy,” by Claude P. Dettloff in New Westminster, Canada, October 1, 1940

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4. A random but poignant soldier in Vietnam, 1965.

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5. 106-year-old Armenian woman guards her home in 1990. 

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6. This Austrian boy got a new pair of shoes in World War II.

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See also: This Pictures Will Make You Re-Evaluate Your Entire Existence

7. Flower power

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8. Animals used to be involved in medical therapy as early as 1956. 

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9. Sweden switched to driving on the right side of the road in 1967. This was the result on the first morning.

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10. A utility worker giving mouth-to-mouth to a co-worker after he contacted a high voltage wire in 1967.

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11. Women were not allowed to run the Boston Marathon in 1967. Kathrine Switzer dodged that rule, and became the first woman to finish despite organizers trying to stop her.

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12. Nikola Tesla sitting in his laboratory with his “Magnifying Transmitter.”

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13. Einstein at Nassau Point, Long Island, New York in the summer of 1939. 

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14. The unbroken seal On Tutankhamen’s Tomb, 1922 (3,245 years untouched).

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15. The last known photo of the Titanic.

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16. A Catholic woman and her protestant husband laid to rest in Holland, 1888.

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17. Painting the Eiffel Tower, 1932.

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18. A grotto in an iceberg seen during the British Antarctic Expedition, January 5, 1911.

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See also: Everything you think you know about what the Earth really looks like is wrong

These shots humanize history for everyone. They also shockingly remind us that they only took place a short time ago. So teach your kids about these moments, and make sure they’re not forgotten. Younger generations will thank you later.