Fort San Domingo, “City of Red Hair" is one of the oldest buildings in Taiwan, with a nearly 400 year history. Originally built by the Spanish, it was handed over to nine different nations including the Dutch, Qing, Japan, British, Australia, USA, and the ROC. Now it is a popular tourist destination in Tamsui.

Fort San Domingo was originally a wooden fort built by the Spanish who were vying for control of Taiwan in 1628. Later the fort came into Dutch control in 1642, and the Spanish were driven from Taiwan. In the process, the Spanish razed the fort to the ground. The fort was rebuilt in brick by the Dutch. The Dutch were expelled from Taiwan thanks to Konxinga and his Ming loyalists.

After the Qing dynasty took Taiwan from the Ming loyalists, they repaired the fort in 1724.

The local Han Chinese at the time called the fort "Red Hair Fort” as a racial slur to the Dutch.

Later, the fort was leased to the British government, who continued to keep a presence there until 1972, and later it was given for a short time to Australia and the USA, and then given to the ROC government in 1980. Now the government maintains the fort as a tourist attraction.