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City of Arts and Sciences (Ciudad de las Artes y las Ciencias) in Valencia, Spain.
It’s one of the most iconic architectural complexes in Europe, designed by Santiago Calatrava and Félix Candela. The futuristic buildings house a science museum, planetarium, opera house, and an oceanographic park — all surrounded by pools and walkways. It’s a must-see destination for architecture lovers and science enthusiasts alike.