Hawaiʻi's largest WWII confinement camp — a somber civil-rights landmark, reachable only by guided tour.
Photo: National Park Service · Public domain · via nps.gov
Honouliuli National Historic Site (redesignated from a national monument in 2019) preserves 123 acres of Hawaiʻi's largest and longest-run WWII incarceration site, in a hot gulch on central-leeward Oʻahu that those held there grimly nicknamed 'Hell Valley.' It opened in March 1943 and ran to 1946, holding about 400 civilians and some 4,000 prisoners of war over its life.
Most of the civilians confined here were American citizens — predominantly Japanese Americans, citizens by birth — along with German Americans and people of Italian, Irish, Russian and Scandinavian descent, arbitrarily suspected of disloyalty. 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 site is closed for self-guided visits, because the Park Service owns no land connecting it to a public road. Access is by monthly guided tour, free, by email reservation, and in 2026 those tours have been booking out with long waitlists. If you can't get on one, the story is told at the Japanese Cultural Center of Hawaiʻi and in the Honouliuli exhibit at the Pearl Harbor National Memorial.
The actual confinement grounds — 123 acres of steep, hot gulch that ran from March 1943 to 1946 as Hawaiʻi's largest and longest-operating incarceration and POW camp.
Insider tipReachable only on an NPS guided tour; there is no self-guided access and no public road in.
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. Most of the civilians held at Honouliuli were American citizens.
Insider tipThis less-known nuance is central to understanding the site.
The longtime interpretive partner, with exhibits and archives — the reliable way to engage with the story when no tour place is open.
Insider tipStart here if no NPS tour is running during your visit.
Plan a trip to this spot →The NPS runs one tour a month, on a Saturday, capped at 26 people and reserved by email — a pilot program while the park works out how to run it at a bigger scale. Tours start at 8:15 a.m. at Hawaiʻi's Plantation Village in Waipahu and run about three hours, shuttle included, at no cost.
Insider tipRSVP to hono_superintendent@nps.gov with the tour date and party size. Bring at least a liter of water, closed-toe shoes with grip, and sun cover. There's a waiver to sign, no strollers, minors must be with an adult, and no photography of the neighbouring university lands.
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.
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.
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 a tour means sun, little shade, and the liter of water the Park Service asks you to carry.
The site is closed for self-guided visits — the Park Service owns no land connecting it to a public road. Access is by guided tour only.
The camp is in central-leeward Oʻahu near Kapolei and Waipahu, 30 to 40 minutes west of Honolulu, but you don't drive to it — tours meet at 8:15 a.m. at Hawaiʻi's Plantation Village in Waipahu and shuttle in, about three hours all told. Free, capped at 26 people, and reserved by emailing hono_superintendent@nps.gov with the date and your party size. They have been filling up with waitlists, so ask well ahead.
If you can't get a tour place, the Japanese Cultural Center of Hawaiʻi in Mōʻiliʻili and the Honouliuli exhibit at the Pearl Harbor National Memorial both 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. There is no public road into the site and no self-guided access. The only way in is an NPS guided tour, held one Saturday a month and reserved by email to hono_superintendent@nps.gov — free, capped at 26 people, meeting at 8:15 a.m. at Hawaiʻi's Plantation Village in Waipahu. They fill up, so ask early.
What is it?
Hawaiʻi's largest and longest-operating WWII incarceration site, running from March 1943 to 1946. About 400 civilians were confined here — most of them American citizens — along with some 4,000 prisoners of war.
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 wartime incarceration different from the mainland?
The mainland removed about 120,000 people en masse; Hawaiʻi selectively detained only about 2,000, mostly community leaders, while the wider community lived under martial law. At Honouliuli itself the civilians held were mostly American citizens, predominantly Japanese Americans born in the United States, alongside German Americans and people of Italian, Irish, Russian and Scandinavian descent.
How can I engage with the story?
Visit the Japanese Cultural Center of Hawaiʻi and the Honouliuli exhibit at the Pearl Harbor National Memorial — both dependable when no tour place is available.
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.
