NORFOLK, Neb. -- People from Norfolk, Nebraska have probably driven or walked by the McMill building probably dozens of times, being a former US Post Office, it now serves as a historical landmark in the city of Norfolk. But the insides are secrets that the public might not know.

“But, it's amazing like this stuff - this was all hidden. I mean, we pulled it up my husband, I pulled it up,” co-owner Nancy Brozek said.  

It was built in 1903, and now serves as a hidden, but historical landmark in the town of Norfolk. Cost estimates of the original building were in the realm of $84,000.

But to Brozek, it’s priceless. 

Every single year, Brozek sets a plan in place to restore parts of the building each year to build on the history of a building that not many may know about.  

The first floor originally used to be a post office, the second floor was an old courtroom and the third floor served as a jailhouse. Brozek explains the years of conversions the building went through into what it is now. 

“The building is actually used for all of our entities that we are part of,” Brozek said. “The first floor is the CPA firm. The second floor is our investment and Wealth Management Floor along with our payroll office. And the third floor houses our retirement plan consulting firm.”

One of the interesting things is that the McMill building actually had different forms of security. Before cameras were even around, they had various hidden tunnels throughout the entire building, where people would be able to watch and spy on other people that worked in this building. 

“There's also some little hidden areas where, back when it was a post office, they must have had a manager crawl up there and just watched people to make sure that they didn't steal some of the mail,” Brozek said.

Yes, you heard that right. Secret tunnels - scattered all throughout the building to keep workers in check. News Channel Nebraska got to have a closer look.

“So, back here on this floor, the walls are black. And then here are the chords on the ceiling. So, as they walked down they knew how far they had got,” Brozek said. 

“Here and here, all the way down to the peepholes that are here,” Brozek said. 

“So, this was open. So, you could see down and up on the next floor, you'll be able to see that,” Brozek said. 

“So, you know it's you can see through here, it's clear but then you could open it and also look in. So, throughout the building, there's peepholes and different places, but a lot of renovation has been done so you couldn't really you can't really access it everywhere. But it takes you up to where you can look down on the first floor,” Brozek said. 

The peepholes were spread out to supervise over a variety of areas in the building. This included hallways, the mailroom and even the bathroom. 

Of course, the holes have been filled and are not used today, but the fact that they were built there in the first place opens many questions about how business was actually done back in the early 20th Century. 

The McMill Building is without a doubt a piece of Norfolk history and is registered as a Nebraska Historical Landmark.