Updated: Mar 25, 2018
This is the Hiển Nhơn Gate of the Imperial City of Huế. The Imperial City was built in 1362 and served as the capital of Vietnam during the reign of the Nguyen dynasty between 1802 and 1945. I think it's the prettiest gate I've ever seen.
Hiển Nhơn means East Gate. The gate is the most decorated gate in the Imperial City of Hue.