Passage: Victoria devoted part of her final years to painting and to visiting the artists' colony of Kronberg, where she regularly met with the painter Norbert Schrödl. In her last days she used to walk in the morning and spent long hours writing letters or reading in the library of her castle.In late 1898, physicians diagnosed the empress dowager with inoperable breast cancer, forcing her to stay in bed for long periods. The cancer spread to her spine by the autumn of 1900, and as she worried about her personal letters (in which she detailed her concern over Germany's future under her son) falling into the hands of the emperor, she requested that the letters be brought back to Great Britain in a cloak-and-dagger operation by her godson Frederick Ponsonby, the private secretary of her brother King Edward VII, who was making his final visit to his terminally ill sister in Kronberg on 23 February 1901. These letters were later edited by Ponsonby and put into context by his background commentary to form the book that was published in 1928.

Question: Where did Victoria spend a portion of her last years?
Kronberg