Hida Great Limestone Cave is a spectacular limestone cave located at an elevation of approximately 900 meters, making it one of Japan’s highest-altitude tourist caves. Inside, visitors can discover an enchanting underground world featuring illuminated formations such as “Night View of the Dragon Palace” and “Dream Palace.” The cave is particularly notable for its unusual helictites, rare stalactite formations that curve in unexpected directions.
The limestone that formed the cave originated from marine deposits, including coral, when this region lay beneath the sea approximately 250 million years ago. Over immense periods of time, natural processes gradually created the cave’s remarkable formations.
The average temperature inside the cave remains around 12°C throughout the year, making it an excellent place to escape the summer heat. Conveniently situated between Hida Takayama and the Oku-Hida Hot Spring Villages, it is an appealing destination for visitors exploring the region.
Hida Great Limestone Cave was discovered in 1965 and opened to the public as a tourist attraction in 1968. The developed sightseeing route extends approximately 800 meters, while the undeveloped sections of the cave stretch for about another 1,000 meters.
Numerous fossils, including sea lilies and fusulinids, have been discovered in the cave. These fossils provide evidence that the area was once covered by the sea approximately 250 million years ago.
Located near the entrance, this section creates a mysterious atmosphere with pale limestone formations rising above underground water illuminated in blue. The combination of light, water, and stone gives the cave an otherworldly appearance.
This area features numerous delicate, icicle-like formations known as soda straws. These slender mineral deposits resemble tiny hollow tubes and demonstrate the intricate beauty of cave formation.
This underground passage connects the first and second cave sections. Various LED lights transform the tunnel into a romantic, fantastical space. According to local lore, couples who walk through the passage together will deepen their love.
Reached by following a narrow passage, this section features formations created by cave coral and striking, dramatic fissures in the rock. Its unusual shapes and textures make it a memorable highlight of the cave.
Located beside the limestone cave, the Ohashi Collection Museum displays approximately 1,000 items, including artworks and ornaments from around the world, distinctive minerals, unusual stones, and fossils. Admission to the museum is included with the cave entrance ticket, making it easy to explore both attractions during one visit.
One of the museum’s most notable exhibits relates to a gold ingot valued at approximately 200 million yen. It was produced in 1989 to commemorate the 25th anniversary of the cave’s discovery. In 2007, the ingot was stolen, but the perpetrators were later arrested and the gold was recovered. By then, however, it had been broken into several pieces and reduced partly to powder.
Today, the exhibition includes a lead replica modeled on the original ingot, alongside the story of the unusual theft and recovery.
The cave’s naturally cool environment is also used to store Japanese sake, shochu, and wine at low temperatures. Long-term storage in these stable conditions can help develop a smoother flavor.
The stored beverages are popular as souvenirs, and visitors can also arrange to keep bottles in storage for later collection. This distinctive use of the cave demonstrates how its natural environment can serve purposes beyond sightseeing.
From rare mineral formations and illuminated underground scenery to fascinating fossils and unusual museum exhibits, Hida Great Limestone Cave offers a memorable journey into the natural history of the region. Its cool interior makes it especially appealing in summer, while the adjacent Ohashi Collection Museum adds another dimension to the visit.