What is Yoshimi Hyakuana?
Yoshimi Hyakuana, located in Yoshimi Town, Hiki District, Saitama Prefecture, is a group of horizontal cave tombs built in the late Kofun period, around 1,400 years ago.
Over 200 holes have been carved into the slope of a rocky hill, creating a strange landscape that looks like an ancient apartment complex.
Its unique atmosphere and mysterious history attract visitors from Japan and abroad.
In addition, this site was used as an underground munitions factory by the former Imperial Japanese Army during wartime, making it notable as a war relic as well.
Yoshimi Hyakuana is a unique spot where archaeology, history, and nature come together.
Highlights of Yoshimi Hyakuana
1. Ancient horizontal cave tombs – a mystical landscape formed by over 200 holes
The main attraction of Yoshimi Hyakuana is the more than 200 holes carved into the hillside.
These are horizontal cave tombs from the Kofun period, dug out of the rock by people of that era.
Human remains and grave goods have been found inside some tombs, providing valuable information about life at that time.
2. Remains of an Imperial Japanese Army underground munitions factory – a wartime relic
Yoshimi Hyakuana also contains the remains of an underground munitions factory built by the Imperial Japanese Army during World War II.
These tunnels were excavated as underground shelters and were used during the war to produce aircraft engines.
The dim, cool tunnels are a valuable place for conveying the history of the war.
You can learn about the site’s wartime history through the museum, brochures, and videos.
3. Habitat of the globally rare "Hikarigoke" (luminous moss)
At Yoshimi Hyakuana you can see the natural monument "Hikarigoke".
Hikarigoke is a moss that glows faintly in dark places, and it only grows naturally in a few locations in Japan.
Seen inside the dark cave openings, the moss glows a yellowish-green and looks very mysterious.
4. Scenic viewpoint
Climb to the top of Yoshimi Hyakuana to enjoy a panoramic view of the beautiful rural landscape of Saitama.
On clear days you can see far into the distance, making it not only a place for historical exploration but also for enjoying nature.
Access to Yoshimi Hyakuana
By train (recommended!)
- Tokyo Station → Tobu Tojo Line to Higashimatsuyama Station (about 1 hour)
- From Higashimatsuyama Station, take a bus to "Yoshimi Hyakuana Entrance" — about 15 minutes
By car
- About 15 minutes from the Kan-Etsu Expressway "Higashimatsuyama IC"
- Free parking available (over 50 spaces)
Useful information for travelers
Opening hours and admission fees
- Opening hours: 8:30–17:00 (last admission 16:30)
- Admission fees: Adults ¥300 / Children ¥200
Recommended clothing
- Comfortable sneakers or hiking shoes
- In summer, bring a hat and sunscreen (the outdoor area is wide and the sun can be strong)
- The underground shelters are cool, so a light jacket is useful
Wi‑Fi
- There are few Wi‑Fi spots nearby, so it’s a good idea to download maps in advance
Language support
- The tourist information office distributes English pamphlets
- Some information boards include English
Summary and Frequently Asked Questions
Summary
Yoshimi Hyakuana is a romantic, history-filled site where you can see ancient tombs, wartime remains, and the enchanting Hikarigoke moss.
It’s a rare attraction in Saitama Prefecture and is especially recommended for those interested in archaeology and history.
With good access from Tokyo, it’s perfect for a day trip.
Frequently Asked Questions
Q: How long should I plan to stay at Yoshimi Hyakuana?
A: You can see the main area in about 1 to 1.5 hours. If you want to take your time, plan for around 2 hours.
Q: Are the underground shelters cold?
A: Yes. They remain cool even in summer, so bringing a light jacket will make your visit more comfortable.
Q: Can you see the Hikarigoke year‑round?
A: Yes. It can be observed throughout the year, and it often looks particularly beautiful on rainy or very humid days.
Q: Are there places to eat nearby?
A: Around Higashimatsuyama Station you can find many restaurants serving Saitama specialties such as "Higashimatsuyama yakitori" and "Musashino udon."
Q: Is Yoshimi Hyakuana suitable for children?
A: Yes! The site has gentle slopes and feels like an adventure, so it’s popular with children.
Visit the mysterious Yoshimi Hyakuana and set out on a journey to experience history and nature!
