Ershawan Fort, also known as Haimen Tianxian, is a historic fortress situated on the eastern side of the entrance to Keelung Harbor in Taiwan. Built by the Qing Dynasty in 1840 to defend against the British, Ershawan Fort stands as a testament to the rich military history of Taiwan. The fort is renowned for its unique structure and strategic positioning, offering sweeping views of the harbor and the sea. Ershawan Fort is constructed of stone and brick, featuring walls that reflect the style of traditional Chinese fortifications. It encompasses barracks, gun emplacements, and a main gate that exhibits the blend of Chinese and Western military architecture. The fort was heavily involved in battles during the Sino-French War and later served various military purposes until it was eventually demilitarized. Today, Ershawan Fort is a popular tourist attraction, providing visitors with a glimpse into Taiwan's past through its well-preserved structures and historical significance. Visitors can explore the cannons that once protected the coast, navigate the old tunnels, and enjoy cultural exhibits highlighting the fort’s past.