Fort Christianvaern is a historic fort located in Christiansted, U.S. Virgin Islands. Built in the 18th century by the Danish West India Company, it served as a military stronghold to protect the island from potential invasions and piracy. The fort features a distinctive yellow exterior and is one of the best-preserved examples of colonial military architecture in the Caribbean. Today, Fort Christianvaern is a popular tourist attraction and part of the Christiansted National Historic Site. Visitors can explore its walls, cannons, and museum exhibits that showcase the history of the fort and the surrounding area. The site offers a glimpse into the colonial past of the Virgin Islands.