The Gaixia site, south of Bengbu near the town of Lingbi, marks the location where Xiang Yu — the brilliant, impetuous rebel who came closer than anyone to preventing the Han Dynasty — made his final stand after being surrounded by Liu Bang's forces. The battle is one of the pivotal moments of Chinese history: had Xiang Yu won, there would have been no Han Dynasty, no consolidation of the empire, and the entire subsequent trajectory of Chinese civilization would have diverged.
The site today is not dramatically preserved — the plains of northern Anhui don't hold ruins well. There is a memorial park with a statue of Xiang Yu and some interpretive markers, and the surrounding landscape of flat agricultural fields gives you a genuine sense of the terrain over which the armies maneuvered. Chinese visitors come with the weight of the story already in their heads; foreigners who know the history will find it atmospheric. Those unfamiliar with the Chu-Han Contention might find it underwhelming.