New York City, USA

Its skyline, the most recognizable on Earth, showcases steel, limestone, glass, and brick in a 150-year continuous building boom. More than 20% of Manhattan's buildings were constructed before 1920, offering a living timeline of skyscraper evolution. The Hudson Yards development and the rebuilt World Trade Center demonstrate modern ambition, while the High Line's transformation of a 1.45-mile elevated rail line into a park redefines urban reuse. No other city on this list matches New York's sheer concentration of landmarked structures, with over 1,400 individually designated landmarks citywide.