Fort Ruger

Fort Ruger Historic District is a military installation around Diamond Head Crater that features multiple fortification structures and fire control stations spread across the area. These elements were built to take advantage of the natural elevation provided by the crater for defense purposes.

The United States acquired Diamond Head and surrounding land in 1905 to build its first military installation in the Hawaiian Islands. The site was later named after a senior military officer and served as a key defensive position for the region.

This place represents an early chapter of American military presence in Hawaii and reflects how the islands became strategically important for defense. The fortifications remain visible in the landscape and shape how people experience the Diamond Head area today.

The historic district is located along Diamond Head Road and marked by stone gates that serve as reference points for visitors. Some structures sit on slopes, so be prepared for walking on uneven terrain in certain areas.

One of the fortifications was equipped with eight large mortars positioned to take advantage of the crater's natural height. This arrangement allowed defenders to cover a wide area toward the ocean and surrounding territory.

Location: Honolulu

Inception: 1983

GPS coordinates: 21.26750,-157.80861

Latest update: December 8, 2025 20:02