Fort Frederik is a historic fort located in Christiansted, U.S. Virgin Islands. Built in the 18th century by the Danish, it served as a military stronghold to protect the island from invasions and piracy. The fort features impressive stone walls and a distinctive watchtower, offering a glimpse into the colonial past of the region. Today, Fort Frederik is a popular tourist attraction and is part of the Christiansted National Historic Site. Visitors can explore its well-preserved structures, learn about the history of the Danish West Indies, and enjoy scenic views of the surrounding harbor.