Casa Batllo is a building in the center of Barcelona. It was designed by Antoni Gaudí and is considered one of his masterpieces. A remodel of a previously built house, it was redesigned in 1904 by Gaudí and has been refurbished several times after that. Gaudí's assistants Domènec Sugrañes I Gras, Josep Canaleta and Joan Rubió also contributed to the renovation project.

Casa Milà, popularly known as La Pedrera (pronounced [ɫə pəˈðɾeɾə]) or "The stone quarry", a reference to its unconventional rough-hewn appearance, is a modernist building in Barcelona, Catalonia, Spain. It was the last private residence designed by architect Antoni Gaudí and was built between 1906 and 1912.

Passeig de Gràcia is one of the major avenues in Barcelona and one of its most important shopping and business areas, containing several of the city's most celebrated pieces of architecture. It is located in the central part of Eixample, stretching from Plaça Catalunya to Carrer Gran de Gràcia.

The Basílica de la Sagrada Família, also known as the Sagrada Família, is a large unfinished Roman Catholic minor basilica in Barcelona, Catalonia, Spain. Designed by Spanish/Catalan architect Antoni Gaudí, his work on the building is part of a UNESCO World Heritage Site.

The Manzana de la Discordia or Block of Discord is the name given to a section Passeig de Gràcia in the Eixample district of Barcelona. The Block of Discord is so named because in less than 100 meters we find a major building by each of Barcelona's trio of star Modernist architects.