Hue Citadel Gate - The grounds of Hue Imperial City are...

HUE, VIETNAM - 2014/04/17: Hue Citadel Gate - The grounds of Hue Imperial City are surrounded by walls, and the walls are surrounded by a moat. The water from the moat is taken from the Perfume River that flows through Hue. The Imperial City is called the Citadel which includes the imperial enclosure and the Purple Forbidden City. The setup is similar to the Forbidden City in Beijing. The enclosure was reserved for the Nguyen imperial family of Vietnam but is now a UNESCO World Heritage attraction. (Photo by John S Lander/LightRocket via Getty Images)