5th-century establishments in Vietnam

Hanoi ( ) is the capital and second-most populous municipality of Vietnam. It encompasses an area of , and as of 2025 has a population of 8,807,523. Hanoi had the second-highest gross regional domestic product of all Vietnamese provinces and municipalities at US$48 billion in 2023, behind Ho Chi Minh City. It hosts 78 foreign embassies, the headquarters of the Vietnam People's Army (VPA), its Vietnam National University system, and other governmental organizations. Hanoi has 18.7 million domestic and international visitors in 2022. It hosts the Imperial Citadel of Thăng Long, Ho Chi Minh Mauso