Let's say, for the purposes of argument, that "well-known" means 1% of native English speakers would recognize a single line from the poem.
The most recent one I can think of is 1955:
"I saw the best minds of my generation destroyed by madness"
It's hard to overstate just how absolutely dead poetry is.
On the other hand, I speak Mandarin natively as well, and while I did not receive formal education in Chinese, I do know a fair bit of Chinese poetry.
(I've been waiting the whole day to download the Chinese typing pack on my computer... argh...1 MB isn't that much...)
or maybe doctor seuss?
why poetry when can song?
"You have brains in your head,
you have feet in your shoes.
You can steer yourself,
any direction you choose."
STOPPING BY WOODS ON A SNOWY EVENING
The two lines are...
But I have promises to keep
And miles to go before I sleep
From non-English ones: In Azerbaijani, poetry is strongly linked to music so there's always new stuff coming out.