Christiansted Fort, also known as Fort Christianvaern, is a historic fort located in Christiansted, U.S. Virgin Islands. Built by the Danish in the 18th century, it served to protect the island from pirates and foreign invasions. The fort features thick stone walls, a moat, and several cannons, showcasing the military architecture of its time. Today, Christiansted Fort is a popular tourist attraction and part of the Christiansted National Historic Site. Visitors can explore its well-preserved structures, learn about the island's colonial history, and enjoy scenic views of the surrounding harbor.