Tokyo, Japan

Tokyo is the greatest laboratory of contemporary architecture, with over 50 buildings by Pritzker Prize winners like Kengo Kuma and Tadao Ando completed since 2000. The city's 2020 Olympics spurred the construction of 8 major venues, including Kuma's Japan National Stadium, which uses 47% less steel than a typical modern stadium. No other megacity reinvents itself with Tokyo's speed—it demolishes and rebuilds entire districts every 25 years on average, far quicker than #3 Rome's centuries-old preservation cycles. This constant renewal yields a unique architectural time-lapse: a 12th-century temple beside a glass-clad skyscraper, attracting 14 million architecture-focused tourists in 2023, a figure 30% higher than the runner-up, Paris.