Fort Casey is a historic military installation located on Whidbey Island in Washington State. Built in the late 19th century, it was part of the coastal defense system designed to protect Puget Sound from naval attacks. The fort features large artillery batteries, including the famous Endicott Period coastal artillery, and is now preserved as part of Fort Casey Historical State Park. Today, Fort Casey serves as a popular destination for visitors interested in history and outdoor activities. The park offers scenic views of the Strait of Juan de Fuca and opportunities for hiking, picnicking, and exploring the fort's structures. It also hosts various events and educational programs throughout the year.