144 Years in the Making: How the Sagrada Família Finally Became the World's Tallest Church

144 Years in the Making: How the Sagrada Família Finally Became the World's Tallest Church — and What It Means for Architecture

On February 20, 2026, construction workers placed the final piece of the Tower of Jesus Christ atop Antoni Gaudí's basilica in Barcelona, bringing it to 172.5 meters and completing the longest active construction project in modern architectural history. The story of how this happened is as extraordinary as the building itself.

There is a date that will appear in every architecture history textbook written after today: February 20, 2026. On that morning, in an operation of millimetric precision, workers installed the final element of the Tower of Jesus Christ atop the Sagrada Família in Barcelona. The installation of the upper arm of the cross on the Tower of Jesus Christ, carried out on February 20, 2026, completed the external works of the basilica's central tower — the highest point of the structure. The components were hoisted in seven combined sections: the lower arm, the central core, the four lateral arms, and finally the upper arm. Vatican News

With that final piece in place, the Sagrada Família became what Antoni Gaudí had always intended it to be: the tallest church in the world.

The numbers that define an architectural milestone

The main structure of the Sagrada Família was architecturally completed on February 20, 2026, when the final piece of the central Tower of Jesus Christ was installed, bringing it to its full height of 172.5 meters. Barcelona Tickets

To understand what that number represents, consider the context: the Sagrada Família surpassed Ulm Minster in Germany — which held the title of the world's tallest church for over a century — to claim the distinction. The Tower of Jesus Christ stands 172.5 meters, making it not only the tallest religious structure currently in active use but also one of the most structurally complex buildings ever completed.

When Gaudí died in 1926, only an estimated 10 to 15 percent of the project had been built, including one transept, a crypt, and some of the apse wall. Construction, already slow, was interrupted in the late 1930s by the Spanish Civil War, when most of the designs and models of Gaudí — whose tomb lies beneath the cathedral — were destroyed. aol

That destruction of the original drawings is the detail that makes the 2026 completion not merely a construction achievement but an intellectual one. The teams that brought the Sagrada Família to completion in the 21st century were not simply executing a plan: they were reconstructing and interpreting a vision from fragmentary evidence — surviving photographs, plaster models, hand-drawn sketches, and the physical geometry of what had already been built.

The technology that made 144 years of construction possible

The four-armed three-dimensional cross in glass and glazed ceramics, completed on February 20, 2026, benefited from recent hybrid innovations, with metallic ribs and infill in ultra-high-performance concrete developed specifically for this project. The entire system is calibrated so that, from the external ceramic layer to the internal translucent stone, the total thickness is just 20 centimeters, preserving a sense of openness despite the reduced dimensions. Domus

This engineering specificity is worth dwelling on. The Sagrada Família's construction has required the development of materials and techniques that did not exist when Gaudí conceived the project. Post-tensioned stone, computer-generated geometric modeling derived from Gaudí's original use of catenary arches and hanging chain models, and digital fabrication technologies have all been deployed in the final decades of construction.

Technological evolution, through the use of post-tensioned stone and advanced digital designs, has allowed the towers to grow at a speed that would have amazed Gaudí himself. One of the most significant milestones has been the completion of the group of towers of the Evangelists — Mark, Luke, John, and Matthew — and the tower of the Virgin Mary, crowned with its twelve-pointed star. HCC Hotels

What remains unfinished: the distinction between structural completion and total completion

The February 20, 2026 milestone requires a precise qualification that media coverage has often collapsed. While 2026 marks the completion of the main building, work on the Glory Façade is projected to last another 10 years. Doubts remain about the construction of the grand entrance stairway in Gaudí's original plan, which would now entail demolishing existing apartments and rehousing their inhabitants. ArchDaily

Interior work on the structure will continue throughout 2027 and 2028. The Sagrada Família that visitors experience today is architecturally complete in its vertical structure but not in its complete programmatic vision. The Glory Façade — the main entrance facing southwest, which Gaudí considered the most important of the three — is not yet built. The monumental staircase that would provide the formal approach to the basilica remains unrealized, caught in a decades-old conflict between the foundation's architectural ambitions and the rights of residents in the apartments that occupy the intended site. Vatican News

The tourism and urban economics of completion

The church is already the city's top tourist attraction, with around 5 million visitors a year. The completion of the structural works is expected to accelerate that demand significantly. The Sagrada Família is already the most visited paid attraction in Spain, generating revenue that has funded the final phases of construction — a unique model where the building pays for its own completion through the visitors it attracts while still under construction. ArchDaily

The anticipated completion of the Sagrada Família in 2026 marks a defining moment in architectural history. Its completion will not only enhance Barcelona's tourism appeal but also celebrate Spain's rich heritage. As the final stages progress, the Sagrada Família stands as a powerful symbol of perseverance and creativity. Travel And Tour World

The centenary of Gaudí's death — he was struck by a tram in Barcelona on June 7, 1926, dying three days later — gives the 2026 completion a biographical symmetry that could not have been planned: the building that defined his life, and that he knew would outlast him by generations, reaches its structural apex exactly one hundred years after he left it.

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