Hawaiʻi's largest WWII internment camp — a somber civil-rights site, open only by guided tour.
Honouliuli National Historic Site (redesignated from a national monument in 2019) preserves the site of Hawaiʻi's largest and longest-operating WWII confinement camp, in a hot gulch on central-leeward Oʻahu that internees grimly nicknamed 'Hell Valley.' From 1943 to 1946 it held Japanese Americans and resident immigrants — and later nearly 4,000 prisoners of war.
Hawaiʻi's story differs from the mainland's. Of a Japanese-ancestry population that made up roughly a third of the territory, only about 2,000 were detained, under a 'selective' policy that singled out community leaders — priests, teachers, newspaper editors, businessmen — while the wider community lived under martial law and a climate of fear. Honouliuli stands as a tangible 'never again.'
Important: the camp site itself is not open for self-guided visits — there is no public road into it. Access is limited to occasional NPS guided tours (monthly, by reservation), and the dependable way to engage with the story is through the Japanese Cultural Center of Hawaiʻi and the exhibit at the Pearl Harbor National Memorial. Always verify current tour status before planning.
The actual confinement grounds — a steep, hot gulch that operated 1943–46 as Hawaiʻi's largest and longest-running internment and POW camp.
Insider tipReachable only on an NPS guided tour; there is no self-guided access.
Plan a trip to this spot →Unlike the mainland's mass removal, Hawaiʻi detained only about 2,000 people under a 'selective' policy targeting community leaders, while the whole community lived under martial law.
Insider tipThis less-known nuance is central to understanding the site.
Plan a trip to this spot →The longtime interpretive partner, with free exhibits, archives, and the path to tour access — the practical, reliable way to engage with the story now.
Insider tipStart here if no NPS tour is running during your visit.
Plan a trip to this spot →The NPS runs monthly RSVP tours (first-come, first-served), led by trained volunteers and staff; availability depends on staffing and can pause.
Insider tipTour-takers get a passport stamp; off-tour, it's at the Pearl Harbor visitor center.
Plan a trip to this spot →Championed by survivors, descendants, and the NPS, Honouliuli endures as a reminder of what happens when wartime fear overrides constitutional rights.
Insider tip2026 marks the 80th anniversary of the camp's closure.
Plan a trip to this spot →Pairing Honouliuli with Pearl Harbor — and the Hawaiʻi-raised Nisei soldiers who served while their elders were imprisoned — gives the fullest, most honest picture.
Insider tipThe two sites are about 15–20 minutes apart and administered together.
Plan a trip to this spot →Tropical leeward climate — warm and stable year-round (highs in the low-to-high 80s), notably drier than windward Oʻahu, with rain concentrated November–March. The gulch is hot and exposed, so tours mean sun, little shade, and the need for water.
The camp site is not open for self-guided visits — there is no public road into it. Access is by NPS guided tour only.
In central-leeward Oʻahu near Kapolei/Waipahu, ~30–40 min west of Honolulu. Tours are free, monthly, and reservation-based; meeting logistics are provided at booking. ⚠️ Verify current tour status with the NPS and the Japanese Cultural Center of Hawaiʻi before planning.
If no tour is available, the Japanese Cultural Center of Hawaiʻi (Mōʻiliʻili) and the Honouliuli exhibit at the Pearl Harbor National Memorial interpret the story.
There are no facilities at the site. Base in greater Honolulu or the leeward resort area.
The widest range of hotels ~30–40 minutes east; convenient for pairing with Pearl Harbor and the Japanese Cultural Center.
Booking tipThe most practical base.
Resort-area and town lodging just west — the closest base to the site, with beaches and lagoons.
Booking tipGood for a leeward, lower-key stay.
Can I just show up and visit?
No. Honouliuli is not open for unrestricted self-guided access — there's no public road in. The site is reachable only via occasional NPS guided tours (monthly, by RSVP). Check the NPS and the Japanese Cultural Center for current tours before you go.
What is it?
Hawaiʻi's largest and longest-operating WWII confinement camp (1943–1946), where Japanese Americans and resident immigrants — and later nearly 4,000 POWs — were imprisoned.
Why is it a 'National Historic Site' now?
It was established as Honouliuli National Monument in 2015 and redesignated a National Historic Site in 2019.
How was Hawaiʻi's internment different from the mainland?
The mainland removed ~120,000 people en masse; Hawaiʻi selectively detained only about 2,000, mostly community leaders, while the wider community lived under martial law.
How can I engage with the story?
Visit the Japanese Cultural Center of Hawaiʻi (free exhibits) and the Honouliuli exhibit at the Pearl Harbor National Memorial — dependable even when no tour is running.
How should I approach a visit?
With respect. This is a place of confinement and loss for real families, many of whose descendants still live on Oʻahu.
Pick your vehicle, line up the stops on the way in and out, and carry the whole route in your pocket.
