A limestone mine in Pennsylvania, which houses thousands of cabinets and millions of federal retirement papers, has caught ...

In Wharton, the miners were going after iron. But how the mines are preserved makes a critical safety difference. Because the Sterling Hill mine has become a popular museum, it’s supported by ...

(KDKA) -- An old limestone mine operated by Iron Mountain that's located just ... just federal paperwork and KDKA-TV has taken viewers inside the mine on several occasions in the past.