Japan's abandoned military landscape spans from the Imperial Japanese Navy installations of WWII to the specific dereliction of Okunoshima — the "Rabbit Island" that produced chemical weapons under the strictest secrecy from 1929 to 1945, now overrun by feral rabbits. The Yokohama Negishi Racecourse served as a US military recreation base from 1945 to 1969; the WWII bunker networks of Okinawa are the most extensive surviving Pacific War fortifications in existence; and the remote island fortifications of Japan's Pacific perimeter represent a WWII military dereliction landscape of extraordinary historical depth. Discover the 5 best abandoned military places in Japan, selected from our Japan Urbex Map — 70+ verified GPS locations.
Why Japan Has the Most Layered WWII Military Dereliction in Asia
Japan's WWII military infrastructure — built across an empire that stretched from Manchuria to the Solomon Islands — left a derelict legacy concentrated most densely on its home islands and Pacific perimeter. The combination of extreme secrecy (Okunoshima), extraordinary scale (Okinawa bunker networks) and specific architectural typologies unavailable anywhere else in the world makes Japan's military haikyo a category in itself.
1. Okunoshima – Hiroshima Prefecture — "Rabbit Island", Imperial Japanese Chemical Weapons Factory 1929–1945, Secret Production, Now National Park, Feral Rabbits (Known Location)
Okunoshima is listed as a military base haikyo in Japan's urban exploration community — the island that produced chemical weapons for the Imperial Japanese military from 1929 to 1945 under extreme secrecy. The island was removed from maps during wartime production. Today it is a national park overrun by feral rabbits descended from test animals, with the derelict chemical weapons factory buildings still standing among the rabbit warrens. The combination of the dark history, the derelict factory ruins and the surreal rabbit colony creates one of the most extraordinary haikyo in Japan.
🔗 Sources: Atlas Obscura – Okunoshima | Discover Real Japan – Haunting Ruins
2. Yokohama Negishi Racecourse – Yokohama — Built 1866, US Military Recreation Base 1945–1969, Derelict Grand Stands and Track, Suburban Yokohama Setting (Known Location)
Yokohama Negishi Racecourse is listed as a military base haikyo in Japan's urban exploration record — a horse racing track built in 1866 that was requisitioned by US occupation forces in 1945 and used as a military recreation base until 1969. The derelict Victorian-era grandstands and the overgrown horse racing track create a uniquely layered haikyo: the British colonial horse racing tradition, the US military occupation and the Japanese post-war period all legible in a single suburban Yokohama site. All GPS in our Japan Urbex Map.
🔗 Sources: Haikyo.org – Military Bases Japan | The Travel – Abandoned Japan
3. WWII Bunker Network – Okinawa — Most Extensive Pacific War Fortifications in Japan, Battle of Okinawa 1945, Underground Command Posts and Tunnels, Accessible
Okinawa was the site of the Battle of Okinawa (April–June 1945) — one of the bloodiest battles of the Pacific War, with 12,000 US casualties, 110,000 Japanese military dead and approximately 100,000 Okinawan civilians killed. The Imperial Japanese military built an extensive network of underground bunkers, command posts and tunnel systems across the island that survive in various states of dereliction — the most extensive WWII Pacific War fortifications accessible in Japan. Several underground command post complexes are freely accessible and preserve the specific atmosphere of the final desperate Japanese defensive positions. All GPS in our Japan Urbex Map.
4. Abandoned Coastal Fort – Japan (Multiple Locations) — Imperial Japanese Navy Coastal Artillery, Pre-WWII and WWII, Concrete Emplacements, Sea Views (On Our Map Only)
Japan's coastal defence network — built by the Imperial Japanese military from the late Meiji period (1868–1912) through WWII — placed artillery emplacements and observation posts at strategic points around Japan's coastline and island chain. Several of these coastal forts stand in states of complete dereliction: concrete artillery emplacements with the gun mount foundations still in place, observation slit windows facing the Pacific or Japan Sea and the extraordinary coastal landscape of Japan's dramatic rocky coastline as backdrop. GPS in our Japan Urbex Map.
5. WWII Island Fortification – Japan Remote Islands — Pacific War Remote Island Garrison, Concrete Bunkers and Artillery Positions, Tropical Vegetation Reclaiming, Historical Depth (Carte Urbex Exclusive)
Japan's Pacific War island garrisons — on the Bonin Islands (Ogasawara), the Ryukyu chain and the remote Pacific island territories — left WWII fortification networks in states of extraordinary dereliction: concrete bunkers and artillery positions now consumed by tropical vegetation decades after the war's end. Several of these remote island WWII fortifications are accessible to visitors reaching Japan's outlying island groups — the combination of tropical jungle, Pacific ocean views and WWII concrete creating a military haikyo experience available nowhere else in Japan. Mapped exclusively in our Japan Urbex Map.
Safety Tips
- Okunoshima chemical contamination: NEVER disturb the soil surface near the derelict factory buildings — residual chemical weapon production contamination persists; keep to marked paths and never enter the derelict buildings
- Okinawa tunnel safety: WWII tunnel complexes can have poor ventilation — always carry a torch and never go deeper than 50m from the entrance without specialist guidance; some tunnels contain unexploded ordnance
- Unexploded ordnance: Japan still recovers WWII ordnance regularly, particularly in Okinawa and remote Pacific islands — never touch any metal object partially buried in the ground near WWII sites
- Never explore alone — Japan emergency: 110 (police) and 119 (ambulance/fire); always share your GPS location before entering any haikyo
❓ FAQ
What is the most famous abandoned military place in Japan?
Okunoshima — the "Rabbit Island" in Hiroshima Prefecture that produced chemical weapons for the Imperial Japanese military from 1929 to 1945 under extreme secrecy (removed from wartime maps), now a freely accessible national park where the derelict factory buildings stand among colonies of feral rabbits. For Pacific War fortifications, the Okinawa WWII bunker network is the most historically significant.
Are Okunoshima's chemical weapons factory buildings safe to enter?
The buildings are structurally derelict and off-limits. More critically, residual chemical weapon production contamination persists in the soil around the former production buildings — never enter the buildings or disturb the ground surface near them. The island's marked walking paths allow you to observe and photograph the derelict factory exterior safely.
Can I visit the Okinawa WWII bunkers?
Several Okinawa WWII command post tunnels are freely accessible — notably the former Japanese Navy Underground Headquarters in Tomigusuku (now a managed heritage site with free entry to most sections). Unmarked tunnel systems exist across the island — approach with caution, always carry a torch and never enter any tunnel system that shows signs of structural instability.
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