The Metropol Parasol, Seville, Spain (19/20)

Often called the “Las Setas” (the mushrooms), the Metropol Parasol is an enormous wooden structure in the heart of Seville’s old town. Designed by German architect Jürgen Mayer, the structure is the largest wooden building in the world. Its unique, honeycomb-like design provides shade to the square below and features a stunning rooftop with panoramic views of the city.