The cathedral is expected to reach completion in 2026—144 years after construction on it started in 1882

The Sagrada Familia, located in Barcelona, is perhaps the most famous construction site in the world. It also has a tragic backstory, involving architect Gaudí's tragic death in 1926 and the loss in the Spanish Civil War of many important architectural plans, that explains why it has been unfinished for over 100 years. Gaudí was a visionary who liked to be on the cutting edge of technology, and today it's helping architects continue his grand project. CAD renderings have been employed for some time, and now 3D printers, as they get more sophisticated, are being added to the mix.

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