Declared a UNESCO World Heritage Site in recent years, the Imperial Citadel of Thang Long is no ordinary historical landmark in Hanoi. Towering above the surrounding landscape at a height of 40m, the most impressive portions of this citadel include its central flag tower which is considered the unofficial symbol of the city of Hanoi. Having served as the political capital of ancient Hanoi, rulers governed the country from this seat of power for over 800 years. Occupying pride of place in Ba Dinh, the venue is open to visitors from 8 am to 12.30 pm and then again from 1.30 pm to 7.30 pm.