Samuel Taylor Coleridge's poem "The Rime of the Ancient Mariner" displays characteristics of both Romantic and modern poetry.
The poem's Romantic elements stand out clearly. It contains, for instance, a strong sense of the supernatural. The mariner's experiences with the albatross, the death ship, and the powers and spirits of the sea are all supernatural and deeply Romantic, as is the poem's emphasis on descriptions of the natural world. The poet even personifies elements of nature, like the wind and water—yet another Romantic trend. Over all this lies a strong component of Christian spirituality. The albatross may be interpreted as a symbol of Christ, for instance, and the mariner finds salvation through prayer and learns that love of all creatures is the true meaning of life.
That said, however, "The Rime of the Ancient Mariner" also contains some modern elements that shift away from Romanticism. Coleridge, for instance, experiments with his poetic form, as many modern poets do. He varies his stanza lengths rather than keeping them consistent throughout, and his meter is sometimes rather loose and variable as well. Even his rhyme scheme varies significantly throughout the poem. Further, Coleridge inserts marginal glosses next to the primary text of the poem that offer a secondary perspective. He also deliberately plays with his language, using archaic forms to enhance the linguistic interest of the poem. These kinds of experiments are largely modern in nature.