Oya History Museum — Underground Stone Cathedral

**What to expect:** The museum begins with a small above-ground gallery explaining Oya Stone's history and uses. Then you descend into the quarry via a staircase. The main chamber is 20,000㎡, with geometric pillars left to support the ceiling. The floor is rough stone, lighting is minimal (dramatic spotlights), and the acoustics are eerie — sounds echo for seconds. Photography allowed; bring a tripod for long exposures. **Underground art installations:** The quarry regularly hosts temporary art exhibits and light installations. Check the museum calendar (English available online) for special exhibitions. The annual 'Oya Stone Christmas' (December) fills the quarry with illuminated displays and live music. **Photography tips:** The quarry is dark (ISO 3200+, f/2.8 or wider lens recommended). Use long exposures (1–4 seconds) on a tripod to capture the pillars and ceiling detail. The blue-tinted spotlights create moody, cinematic shots. Bring a flashlight for navigating darker corners. **Oya-machi exploration:** After the museum, walk through Oya town (10 min) to see historic buildings made from local stone — Oya Kannon Temple (carved into a cliff face, 1,200 years old), Oya Stone houses, and stone walls lining streets. The town is small but architecturally unique. **Oya Stone shopping:** Local artisans carve Oya Stone into decorative items — coasters (¥800), small sculptures (¥2,000–5,000), garden ornaments. Buy at the museum shop or Oya-machi craft stores. **Combine with:** Return to Utsunomiya for gyoza dinner (see separate entry). Or visit Futaarayama Shrine (10-min walk from Utsunomiya Station), a 1,600-year-old Shinto site with vermilion buildings and peaceful grounds.