There are some problems with the title's question. There are not many beautiful modern poems, but there are even more beautiful deconstructions. This is determined by modern poetry's reflective and critical attitude towards modernity.
Speaking of beauty, it seems more like a patent for classical poetry. Why do you say this? Beauty, as an aesthetic category, refers to a situation in which the subject and object are in harmony. The object is not only non-threatening, but can even be enjoyed and appreciated. There is a carefree and carefree atmosphere here. The ancients worked at sunrise and rested at sundown. Occasionally they would sleep under a pine tree with a pillow on a stone. They believe that heaven and man are in harmony, and the laws of heaven are constant. Even after death, they believe that life has not come to an end, and the undead continue to live an orderly life like living people. Therefore, ancient poetry is obsessed with the artistic conception of the blending of things and ourselves, and the interplay of scenes; that is the beauty that our people today long for but cannot actually achieve. Although many ancient poets also wrote about the sufferings of the human world, they ultimately lacked a thorough pessimistic orientation because they believed in the reincarnation of heaven and the final retribution of good and evil. Bai Juyi's writings about the sufferings of the lower class are not as satisfying as his writings about official travels and pastoral scenery. Xin Qiji's works mostly express depression and difficult aspirations, and his pastoral poems are also beautiful. As the saying goes: If you are successful, you can help the world; if you are poor, you can only take care of yourself. No matter how unfortunate the ancients were, they would never lose their interest in creating beautiful artistic conceptions; because they believed that the sky is above and God's will bless people.
When we talk about the word "modern", it means the passing of pastoral utopia and the intensification of human crisis awareness since the era of industrialization. People who live in a rural society with acquaintances are easily relieved, while a city with strangers often makes people feel lonely and helpless. Therefore, it is difficult for poetry in the true "modern" sense to be "beautiful" without distraction.
When the process of industrialization has not yet been completed, there are indeed some poets with residual romantic sentiments who continue to be "beautiful". They are determined to Seize the beauty of the twilight and let yourself hold on to the dream of self-deception. Once this dream is broken, their endings are mostly tragic. Pushkin's love poems are intoxicating and they die in a gladiatorial battle. His poems are full of passion. Humanistic idealism is often tortured by the difficulties of reality. While he wrote the sweet song "Lady of Athens", he had to accuse the sins and hypocrisy of the world with "Don Juan". For such a poet who has been in a state of tearing for a long time, even if he doesn't. It is difficult to live long if you die of illness. Therefore, he only lived at the age of thirty-six. Another poet, Yesenin, who was famous for his beautiful poetry, hanged himself and only lived at the age of thirty. When the worry-free era of mankind is gone, who will live forever. Can you forget your feelings? Beautiful."
Generally speaking, the history of modern Western poetry regards Baudelaire as the leader of the general trend of post-romantic creation. His representative work is "Flowers of Evil". This kind of work certainly has nothing to do with "beautiful". "Afternoon of the Faun" by the symbolist representative poet Mallarmé and Valery's "Seaside Cemetery" are also very beautiful. Yes, they Seeing beauty from the other side, imagining beauty from the road to death, but not discovering beauty from reality.