Barcelona's legendary Sagrada Família basilica has been under construction since 1882 and finally the end is in sight.

When completed in 2026, long-dead architect Antoni Gaudí's crowning achievement will look pretty much exactly like a massive alien spaceship constructed completely out of stone. At least, that's what we see in a video released on the basilica's YouTube channel Wednesday.

The project has faced innumerable setbacks over the years, including a devastating fire in 1936 during the Spanish Civil War that left most of Gaudí's plans for the building destroyed. Architects and builders have been painstakingly working to recreate the Catalan hero's vision ever since.

Gaudí' used to joke that his client, God, was in no hurry to see the church completed. So while current architect Jordi Faulí says the world will have its masterpiece in 2026, we suggest holding off on buying any plane tickets.

CORRECTION: An earlier version of this story identified Sagrada Família as a cathedral. It is a basilica.

Loading Slideshow...
  • Nave of Sagrada Familia

  • Sagrada Familia

  • Sagrada Familia illuminated

  • Roof architecture at Casa Batlló.

  • Casa Batlló

  • Casa Calvert

  • El Capricho (1883-85)

  • Bishop's Palace

  • Park Güell

  • Antoni Gaudi's Park Guell in Barcelona, Spain (Photo by: Virginia Sherwood/Bravo/NBCU Photo Bank via Getty Images)

  • Bodegas Güell

  • Palau Güell (1886-88)

  • The salamander in Park Güell

  • Torre Bellesguard

  • A view of the exterior of Gaudi's Sagrada Familia. (Photo By View Pictures/UIG via Getty Images)

  • Sagrada Familia illuminated

  • Sagrada Familia illuminated

  • Sagrada Familia illuminated

  • Sagrada Familia illuminated

  • NEXT: Beautiful Barcelona

  • A group of people chat in a passage in Barcelona, Spain. (Photo by David Ramos/Getty Images)

  • A view of 'La Rambla' street in Barcelona, Spain. 'La Rambla' is a street in central Barcelona, a 1.2 kilometer-long tree-lined pedestrian mall between Barri Gotic and El Raval, it connects Plaza Catalunya in the center with the Christopher Colombus monument at Port Vell. (Photo by Samuel Aranda/Getty Images)

  • La Rambla roundabout in a square of Figueres, Gerona province. (Photo by JMN/Cover/Getty Images)

  • Artists perform a show in La Rambla street in Barcelona, Spain. (Photo by Samuel Aranda/Getty Images)

  • Plaça de Catalunya

  • A scenic view of Sitges, Spain. (Photo by Bruce Bennett/Getty Images)

  • Barcelona. Old city: Gothic District. (Photo by JMN/Cover/Getty Images)

  • Cathedral of Barcelona. Cloister. Gothic art. (Photo by JMN/Cover/Getty Images)

  • Skyline of Barcelona's Old, Gothic and Raval Quarters in Catalonia, Spain.

  • A night view of Plaza Sant Jaume square in Barri Gotic Barri Gotic ('Gothic Quarter') is the centre of the old city of Barcelona. Despite several changes undergone in the 19th and early 20th century, many of the buildings date from Medieval times, some from as far back as the Roman settlement of Barcelona. (Photo by Samuel Aranda/Getty Images)

  • Plaza del Rey. Barcelona. Gothic architecture. (Photo by JMN/Cover/Getty Images)

  • Gothic quarters of Barcelona, Catalonia, Spain.

  • A passage in the Gothic quarter of Barcelona, Catalonia, Spain.