Casa Milà, popularly known as La Pedrera, is not simply a modernist building; it is a habitable sculpture, an architectural manifesto conceived by Antoni Gaudí. At first glance, it fascinates with its undulating facades that evoke a sea of stone and its iconic rooftop populated by stone warriors. However, the true magic of La Pedrera lies in the details.
Gaudí conceived this building (constructed between 1906 and 1912) as a living, organic work, loaded with religious symbolism, natural references, and engineering solutions that were revolutionary for their time. From the controversial designs of its interiors to the ingenious chimneys that look like creatures from another world, La Pedrera is an inexhaustible source of curiosities and mysteries.
We will explore the lesser-known details that make La Pedrera an unrivalled masterpiece, revealing the stories, symbolism, and technical solutions that made it such an avant-garde building and, at the same time, so criticised by its contemporaries. With Shuttle2Sun‘s low-cost and sustainable shared transfer services and private transfer services, you can comfortably reach Barcelona from Barcelona Airport, Barcelona Port, Girona Airport, Reus Airport and Camp de Tarragona AVE train station.
From Nickname to Masterpiece: Casa Milà or La Pedrera?
Antoni Gaudí‘s monumental work has two names, each with a very different history: Casa Milà is the official name, while La Pedrera (The Quarry) is the nickname by which it became known worldwide.
The official name, Casa Milà, refers to its developers and first owners: the wealthy couple formed by Pere Milà i Camps and Roser Segimon i Artells. The couple commissioned Gaudí to design a new building on Paseo de Gracia in the early 20th century, seeking a prestigious residence that would combine their main home with rental apartments.
La Pedrera: A Derogatory and Popular Nickname
The nickname La Pedrera arose almost immediately during its construction, and not exactly as a term of endearment. The people of Barcelona at the time referred to the building in this way because of its irregular, unpolished stone façade and its rocky, rough appearance, reminiscent of an open-air quarry.
The term was often used pejoratively by critics who considered Gaudí’s style too groundbreaking, eccentric and far removed from the aesthetic norms of conventional modernism. Paradoxically, the nickname that arose from criticism has now become the popular and affectionate name par excellence, surpassing the official name in common use and cementing the identity of Gaudí’s masterpiece.
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The Unfinished Railings on the Roof Terrace
The roof terrace of La Pedrera is a global landmark thanks to its iconic chimneys that resemble mythical warriors, but it harbours a small architectural anomaly that often goes unnoticed: the perimeter railing around the interior courtyards.
While the entire structure of Casa Milà is famous for its rejection of straight lines and its organic sinuosity, this railing on the roof is surprisingly simple and geometric. Gaudí had begun to design a perimeter fence model, but his work on La Pedrera was hampered by financial problems and disputes with the owners, which prevented him from completing all the decorative and protective details. Anecdotally, in response to the Milàs’ concern about the lack of a railing, Gaudí supposedly replied: ‘Don’t worry about putting up a railing, there aren’t any in the mountains.’
The Paso de Ronda: La Pedrera as a Fortification
Beyond its flowing curves and sculptural chimneys, Gaudí included an element on the roof that evokes medieval military architecture: the Paso de Ronda (a patrol walkway).
This walkway, visible only from the terrace itself, is a perimeter path that runs along the top of the façade, creating the sense of a wall or fortification. With this detail, Gaudí established a parallel between the building’s exterior façade and the wall of an ancient castle.
Along this path, the architect strategically placed four small domes, reminiscent of the shape of a Prussian helmet, which are believed to have been placed to reinforce the building’s stability at key points.
An Innovative Structure
One of the most profound and, at the same time, most visible secrets of La Pedrera lies in its structure. The undulating stone façade is not, as one might assume, responsible for supporting the building’s weight.
This is the great innovation that allowed Gaudí to conceive Casa Milà as a flexible and organic structure. The Catalan architect designed an internal skeleton based on stone, brick, and steel pillars, which are the true load-bearing elements of the construction.
By freeing the façade from its load-bearing function, Gaudí achieved two key architectural feats: on the one hand, the absence of fixed load-bearing walls in the apartments allowed the owners to completely redistribute the interior spaces. And, on the other hand, as the stone was not needed to support the weight, the façade became a curtain wall. This allowed Gaudí to “pierce” it at will, creating large windows and balconies with organic shapes that maximise light and ventilation, breaking with the rigidity of traditional architecture.
A Secret from the Civil War: The Underground Bunker
Although Antoni Gaudí completed La Pedrera in 1912, the building’s history continued to be written long after. One of the most surprising discoveries made during its renovation in the 1990s was the existence of an underground bunker in its basement.
This space was not part of Gaudí’s original plans, but was built later, during the Spanish Civil War (1936-1939), to protect the tenants and residents of Passeig de Gràcia from the intense aerial bombardments that Barcelona suffered.
Gaudí’s La Pedrera is a universe of details where every curve and every stone holds a story. Come and discover all the secrets and curiosities hidden behind the façade of this masterpiece. Remember that Shuttle2Sun offers low-cost and sustainable shared transfer services and private transfer services to get you to Barcelona from Barcelona Airport, Barcelona Port, Girona Airport, Reus Airport and Camp de Tarragona AVE train station.
