Check out Pingcheng Fort and learn about its role in defending against attacks and invasions. This structure has witnessed some interesting history during its time.
When you've finished up at this Fengshan District history-filled fortress, why not make your way to Lotus Pond, Kaohsiung Museum of Fine Arts, and Former British Consulate at Takao? They're not very far from Pingcheng Fort and also a hit with many travelers.