- What you can expect -The Casa Batlló is one of Antoni Gaudí's architectural masterpieces and an iconic modernista landmark. Situated on Passeig de Gràcia, this building stands out from the rest due to its eye-catching design and colour. It is a UNESCO World Heritage Site.We invite you to visit the Casa Batlló which has transcended the concept of a building to become a legendary icon of art, architecture and art nouveau. Here, light, colour and shapes interact with wood, glass, ceramics and quarried stone in Gaudí's characteristic fantastic and breathtaking style