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| Source: The Atlantic Beirut, Lebanon. Limestone. |
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Source: The Atlantic
Route 61 in Centralia, Pennsylvania. A fire started at the town dump in 1962, which spread to the coal
mines. The fire still burns underground today and is expected to continue for 250 years.
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Kasukabe, Japan. A 6 km long concrete water tank built 50 meters beneath the surface can accommodate 670,000 tons of floodwater and serves to protect Tokyo and surrounding areas. |
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| Source: The Atlantic Niah Great Cave in Sarawak, Borneo. |
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| Source: The Atlantic Kuha Karuhas Pavillion in Bangkok, Thailand |
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| Source: The Atlantic Puerto Princesa Subterranean River National Park in Palawan, Philippines. The 8.2 km river is the longest navigable underground river in the world. |
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