Geneva is Switzerland's second-most-populous city (after Zürich). It is a center for diplomacy due to the numerous international organisations such as the United Nations, the Red Cross and the World Health Organization to name just a few. Architecture in Geneva is a blend of historical and modern styles, reflecting the city’s rich cultural heritage and international significance. One of the city's most prominent historical structures is Cathédrale Saint-Pierre, which dates back to the 12th century. The Palais des Nations, built between 1929 and 1938, serves as the European headquarters of the United Nations. Its imposing design, featuring vast marble interiors and art-deco influences, reflects the ideals of diplomacy and global cooperation. In more recent times, Geneva has also embraced modern architectural designs. The Geneva International Conference Centre (CICG), designed by André and François Gaillard along with Alberto Camenzind, represents a contemporary take on large-scale public buildings. Its bold and functional design, featuring state-of-the-art conference rooms and public spaces, reflects the city’s status as a global diplomatic hub. Overall, Geneva’s architectural landscape is a testament to its historical roots and ongoing commitment to innovation, sustainability, and global diplomacy.