Elon Musk referenced a Pennsylvania limestone mine where federal employee retirements are processed, but the mine's story is complicated.

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In the Oval Office on Tuesday, Elon Musk said the government stores and processes retirement paperwork in an old limestone ...

Discover these caves in Alabama — hidden underground wonders that offer unforgettable adventures beneath the surface!

Hundreds of federal workers process thousands of retirement applications every month, by hand in a converted former mine.

Discover the wonders of Ohio Caverns, "America's Most Colorful Caverns," and explore the underground beauty of stalactites, ...