The Sagrada Familia is a unique piece of architecture that cannot be found anywhere else in the world but in Barcelona. Built by the world-renowned architect - Antoni Gaudi, the structure has complex designs, with intricate ornate walls on the exterior, and implemented the Art Nouveau style as a surface decoration with elements of Catalan Modernism, and Spanish Late Gothic design.
This Roman-Catholic church in Barcelona is breathtakingly beautiful and what makes it historically significant is that the church has been under construction for over a century, ever since 1882. Even though the work is still in progress, it is undoubtedly the most visited attraction in Barcelona.
Sagrada Familia is a UNESCO World Heritage Site and is known for its unique architecture style, and is one of the seven buildings by Gaudi that fall under this category.