The old imperial capital of Vietnam from the 18th century until early in the 20th was designated a UNESCO World Heritage site in 1993. There are many things to see in and around Hue, so you will want to spend two or three days, at a minimum, exploring the sights. If you visit in the spring or fall, when the whether is cool and dry, you may want to rent a bicycle since most of the sights are not far from the city and the terrain is relatively flat.
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Hue is a city that you'll want to spend some time just wandering around in. However, here's a list of the "don't miss" sights:
Hue's own version of China's forbidden city, the citadel was home to the Nguyen emperors of Vietnam from the turn of the 18th century until 1945. Much of it was destroyed during the war, but enough remains to make it well worth a visit.
Thien Mu Pagoda
This Buddhist temple dates from the turn of the 17th century. Its seven story pagoda has become something of a symbol of Hue and Vietnam.
Scattered around the countryside south and west of Hue are the tombs of the Ngueyn emperors. Better preserved than the citadel, you absolutely have to see some of these places to believe them.