Seoul, the capital of South Korea, is a huge metropolis where modern skyscrapers, high-tech subways and pop culture meet Buddhist temples, palaces and street markets. Notable attractions include futuristic Dongdaemun Design Plaza, a convention hall with curving architecture and a rooftop park; Gyeongbokgung Palace, which once had more than 7,000 rooms; and Jogyesa Temple, site of ancient locust and pine trees. Population: 9.603 million (2025). Mayor: Oh Se-hoon. Area: 605.2 km². Elevation: