"The Magic Mountain" is a novel written by German author Thomas Mann and was first published in 1924. The novel is set in a tuberculosis sanatorium in the Swiss Alps and follows the story of a young German named Hans Castorp who travels there to visit his sick cousin.

Hans initially plans to stay for only a few weeks, but ends up spending seven years in the sanatorium, during which he experiences a profound intellectual and spiritual awakening. The novel is known for its exploration of the themes of illness, death, and the meaning of life.

The magic mountain of the title refers to the sanatorium, which serves as a symbol of isolation and introspection. The novel uses this setting to examine the ideas of Nietzsche, Schopenhauer, and other philosophical thinkers, and to explore the broader human condition.

"The Magic Mountain" is widely regarded as one of the greatest works of 20th-century German literature and is considered a classic of modern European literature. It is known for its dense, philosophical style and its use of allegory and symbolism. The novel is also notable for its exploration of the existential questions that plagued Europe in the aftermath of World War I and the cultural and intellectual ferment of the early 20th century.