The Tomb of Tu Duc is probably the "one to see" if you only have limited time. It is the closest to Hue of the larger, more impressive tombs. The tomb is an enormous walled enclosure, practically a palace in its own right. In fact, the guidebooks and plaques on the walls will tell you that the emperor spent a lot of time here during the tomb's three years of construction. It seems likely that the tomb site served as a sort of summer palace.