Media coverage – Nagasaki is selected as “52 Places to go in 2026" on The New York Times.

Nanatsugama Limestone Cave (ナナツガマショウニュウドウ)

Area
Saikai
Category
Nature&Hot Spring
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Designated as a National Natural Monument of Japan, this spectacular limestone cave maintains an average temperature of around 15℃ all year round. Even in the middle of summer, you'll be surrounded by refreshingly cool air—it feels just like walking through nature's own air conditioner! 
Believed to have been formed around 30 million years ago when the seabed was uplifted, the cave is home to breathtaking limestone formations sculpted by nature over countless years. 

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