What cities have been built in the last 50 years?

In the last 50 years, several cities have been built or significantly developed, including Brasília, Brazil, which was inaugurated in 1960 as a planned city; and the new administrative capital of Egypt, known as the New Administrative Capital, which began construction in 2015. Other examples include Songdo in South Korea, developed in the early 2000s as a smart city, and Putrajaya in Malaysia, established in the 1990s as the federal administrative center. These cities often focus on modern infrastructure, sustainability, and urban planning.