Grand boulevards are monumental witnesses to history. Their architectural splendour has endured for centuries, while they have remained stages for political and cultural change. Home to government buildings and renowned cultural institutions, they are also vital public spaces for residents and major attractions for tourists. Today, however, these iconic boulevards face global challenges. Luxury brands, international property companies, climate-neutral urban planning and changing patterns of use are reshaping their future. The challenge is to preserve historic façades and cultural identity while adapting to new needs. Traffic, urban transformation, housing and workplaces must be carefully balanced.