6. Sagrada Familia, Barcelona, Spain
The Sagrada Familia began construction in the late 1800s, but is still unfinished. The construction team plans to complete six more towers by 2026, to mark the 100th anniversary of the death of Antoni Gaudí, the architect who designed the church. When completed, the church will be the tallest church in Europe, standing nearly 172 m tall and with a total of 18 towers.
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