The Eternal Golden Castle is actually a small fort, around 1.7 kms from Anping Old Fort. It was built by Qing Official in 1876 to safeguard the coastline of Tainan. It took us 30 minutes to walk from Anping Old Fort.
The huge flat area at the middle of the fort was the resting and training ground for the soldiers. The armory, replica of huge cannons pointing towards the coastline, and the moat can be seen there. Some sources stated that the fort was built with the bricks dismantled from Fort Zeelandia.
We would recommend to visit the site together with Anping Old Fort.