Big Dali fan, but I see @Kopstar has already put some of his forward, so I’ll throw something else into the ring
Nighthawks - Edward Hopper. 1942
Christina’s World - Andrew Newell Wyeth. 1948
Freedom From Want - Norman Rockwell. 1943
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i love the sky on that one but 'What is that hairy thing (left hand side) growing up toward it? 
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Un cyprès. 
Black Square by Kazamir Malevich,
If ever a picture paints a 1000 words, this is the 1.
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In MOMA NY , great stuff
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I don’t know if you would describe these as art, of course they’re more science, but there’s something I find aesthetically beautiful in the early mappa mundi such as…
Hereford Mappa Mundi
The Ebstorf map
The oldest surviving terrestrial globe, the Erdapfel from 1490-1492
I imagine it would have needed significant tweaking just as it was finished. Can you imagine the reaction of its creator, Martin Behaim, when Columbus returned from the Americas in the following year?!
Still, might have made it even more unique?!
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I think science and art are almost intertwined, especially in the earlier periods. What was art originally but a study of the natural sciences a lot of the time.
Artists had to make their own paint and ended up creating new colours; perspective and composition incorporated mathematics that applied to architecture. The monks that hand wrote and illustrated great works beautifully. Men like Leonardo, brilliant inventors as well as outstanding artists.
So I think you have every right to consider these old maps as art.
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Terracotta Army…
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https://images.app.goo.gl/4PgX5ry39fPFPheV9
The Meeting on the Turret Stairs. Burton.
Currently my favourite is Castle (unfinished).
By my 6 year old.
More objectively, probably one of many by Tom Roberts or another Heidelberg school - Golden summer by Arthur Streeton:
Also adore Boyd’s Shoalhaven Series and I have dibs on this painting:
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That’s a brilliant painting by your 6 year old. 
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Not for nomination, but since we’re being proud of our kids, my daughter had a piece featured in the National Saturday Art Club summer show this year which was nice
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Blimey, I’d argue that she probably asked you to sit for it for a bit too long.
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had a bit more time to think about this, and i said it before but i would nominate
The School of Athens by Raphael.
This painting just makes you think, as there is so much to look at,
a collection of the greatest thinkers of their time
With each identity given away with simple had gesture, poses or held item,
And Raphael has a small cameo role in the corner, apparently!
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Not many propositions from the XXth century so far. Here are two I love:
Paul Klee: Ad Parnassum (1932, Kunstmuseum Bern, 100 x 126 cm)
Wassily Kandinsky: Murnau - Landscape with Green House (1907, was recently sold to a private for more than 20 millions GBP, 33 x 44,5 cm)
