The City of Hue in Vietnam is often referred to as the “Imperial City”. It is best known for the walled palace within the citadel, which is the Complex of Hué Monuments recognized by UNESCO as an important cultural site. This city also served as the former Imperial capital of Vietnam. It was built in the late 14th century (specifically in 1362) and was completed after 203 years. The building is considered an important symbol of wealth and power. This site was added to the list of UNESCO World Heritage Sites in Vietnam in 1993.

The layout of this monument can be broken down as follows: Imperial City gates, Purple Forbidden City main gates, outer court, temples and places of worship, inner court, gardens, and pavilions.

According to everything-everywhere.com