Fort Casey Historical State Park is located on Whidbey Island in the state of Washington. The park is a popular destination for history enthusiasts and outdoor enthusiasts alike. There are several reasons to visit, including the park's historic military buildings and scenic views of Puget Sound and the Olympic Mountains. Visitors can explore the fort's bunkers, gun emplacements, and other military structures that were used during World War I and World War II.

One of the most notable points of interest in the park is the Admiralty Head Lighthouse, which was originally built in 1861 and replaced with the current structure in 1903. The lighthouse is open for tours and offers stunning views of the surrounding area. Another interesting feature of the park is the Keystone ferry terminal, which provides access to Port Townsend on the Olympic Peninsula.

In addition to its historical and architectural features, Fort Casey State Park is also a popular spot for outdoor activities. Visitors can enjoy hiking, biking, fishing, and boating in the area. The park's beaches are also a great place to relax and take in the beautiful scenery.

The best time of year to visit Fort Casey State Park is during the summer months, when the weather is warm and the park is bustling with activity. However, visitors should be prepared for crowds during peak season. Spring and fall can also be a good time to visit, as the weather is mild and the crowds are smaller.

Overall, Fort Casey Historical State Park offers a unique blend of history, architecture, and natural beauty that make it a must-visit destination in Washington.