Barcelona is famous for its many artistic and architectural wonders, and one of the most notable designers in the city is Antoni Gaudi. Each Gaudi building in Barcelona is unique in its own right, featuring interesting shapes, textures, and materials that set them apart from traditional architecture. His style was inspired by nature and organic forms, which is evident in the curves, spirals, and colorful mosaics that make each building a work of art.

1. Sagrada Familia: This is Gaudi's most famous work and is a must-see site in Barcelona. It is a huge Roman Catholic church that began construction in 1882 and is still unfinished. The most remarkable thing about this building is its towering spires, which seem to stretch up to the sky.

2. Casa Batlló: This building is a masterpiece of modernist architecture and is a great example of Gaudi's organic and sculptural style. The facade of the building is designed like a dragon, with colorful tiles and a unique shape.

3. Casa Milà (La Pedrera): This building was completed in 1912 and is another example of Gaudi's innovative style. Its unique shape and structure was inspired by natural forms - at the time, it was considered a little too avant-garde for some residents.

The Sagrada Familia is such an incredible sight to see. There are so many things to admire and appreciate. The church itself is truly breathtaking. Its towering spires and intricate facades make it one of the most iconic landmarks in Barcelona. Make sure to take a walk around the entire building to fully appreciate its beauty. The Crypt contains the tomb of architect Antoni Gaudí, who devoted much of his life to designing the Sagrada Familia. Take a moment to pay homage to his work and his legacy. The Nativity Façade is perhaps the most intricate and detailed of the Sagrada Familia's three facades. It's full of sculptures and carvings that depict various scenes from the story of Jesus' birth. Take a close look at each one to appreciate the level of craftsmanship. If you're feeling brave, you can climb up one of the Sagrada Familia's towers for an incredible view of the city. Just be aware that the climb is steep and narrow! Overall, whether you're interested in architecture, art, or religion, the Sagrada Familia has something for everyone. It truly is a must-see when visiting Barcelona.