A mystery is being unraveled in Burnsville, North Carolina, as renovation crews peel away layers of a century-old building that has hidden spaces, windows below ground level and subterranean rooms that are perpetually dark.
For the past 30 years, the 6,000-square-foot bulwark served as the Yancey County Public Library, but no amount of shelving could mask the fact something more complex and was just below the surface.
This includes a steel door that was installed in the basement…