SubTropolis
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This massive man-made cave spans an impressive 55,000,000 square feet. SubTropolis is said to be world's largest underground storage facility. While this claim hasn't yet been substantiated, the cavernous depths are certainly the perfect temperature for storage - naturally maintaining 65-70 degrees Fahrenheit year round. (Photo by Traveling Lower 48)
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SubTropolis
SubTropolis
May 17, 2021
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SubTropolis
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SubTropolis
SubTropolis
April 25, 2023