This report is about the famous architect of Barcelona, ​​​​Antoni Gaudi. It also explores the intrinsic relationship between the city and the architect. The article presents a brief biography of Gaudi and examines the general characteristics, influences and styles of his work and creations. The article describes four of Gaudi's many projects in Barcelona: the Holy Family (La Sagrada Familia), La Pedrera (Casa Milà), La Casa Batlló and Park Güell. Antoni Gaudi i Cornet was worn in the province of Tarragona in Catalonia in 1852. At the age of 16 Gaudi left his hometown of Reus to enroll in the architecture school of Barcelona. At that time Barcelona was a rapidly growing city thanks to the start of its industry. It was the main city of Catalonia where at the time Gaudi arrived there was a large anarchist independence movement. Like the followers of this movement, Gaudi loved Catalonia above all else. For this reason the main influences on his work were Moorish, Oriental and Gothic architecture, all traditional Catalan styles. New foreign movements such as Arts and Crafts, Impressionism, and Art Nouveau were also discussed in modernist intellectual society. Art Nouveau is the movement that influenced Gaudi the most, stimulating him to experiment with new materials and new forms, thus helping him to give up imitating historical styles and find his way. The term Art Nouveau is French and means New Art. It was a remarkable movement in late 19th century art history and lasted from about 1880 to 1915. The style is characterized by the use of organic and ornamental shapes and patterns and the integration of all aspects of art and design. The movement had different names in different languages. In Germany it was called Jugendstil, in Italy Liberty Style, in Austria Sezession and in Spain Modernista or Modernismo. The opportunities offered by Catalonia's socioeconomic and political environment were endless. Catalans such as Antoni Gaudí often showcased the region's diverse artistic techniques in their works. By imitating nature, these artists symbolically rejected the province's ever-growing industrial society. Gaudí, among others, promoted the Catalan nationalist movement by incorporating elements of Catalan culture into his designs. Almost all of Gaudí's buildings were built in Barcelona. His first projects reflect the late 19th century taste for color and peasant or popular traditions. In Gaudi's work, this led to the use of colored tiles of the type used in Moorish architecture. His best-known designs from the early 1900s include two houses, the