For nearly 44 years, Collin Gau has gone to work at one of Minnesota's most historic workplaces. His round second-floor office is part of an octagonal granite tower designed nearly a century ago by renowned St. Paul architect Clarence H. Johnston.
The architectural significance is even more noteworthy when you realize that unpaid builders mined the granite from on-site quarries.
"It would have been hard labor," said Gau, the warden at St. Cloud's 127-year-old prison. "All the work was done by hand with hammers and chisels. There were no hydraulics yet, so block-and-tackle ropes lifted all those granite blocks."
Legislators picked St. Cloud's granite-rich location for Minnesota's third prison in 1887, figuring the state could make a buck selling inmate-mined stone that came from two quarries inside the prison's original wooden stockade walls.
When other St. Cloud quarry owners complained that the state was undercutting their business with its free prisoner labor, lawmakers halted the commercial operation in 1891.
But inmates were far from off the hook. From 1905 to 1922, they hammered, chiseled and hoisted enough blocks from those prison quarries to build a 22-foot-high stone wall covering a mile and half of the prison's perimeter. Four-feet-wide at the base and tapering to 3 feet across the top, it's believed to be the world's second-longest prisoner-constructed wall. The Great Wall of China used criminals, among thousands of workers, to construct miles of its meandering defenses starting centuries ago.
St. Cloud's big wall is also a fixture for generations of families driving Up North via Hwy. 10.
"So many people have told me how they would drive by as kids and dad would say: 'You better be good, or else that's where you'll end up,' " Gau said.