Photos: A look inside Barrel Theory Beer Company

It may have a Prohibition-era tunnel.

Barrel Theory's new taproom is packed with history – and possibly a Prohibition-era tunnel. 

The brewery opened in a historic building in the Lowertown neighborhood of St. Paul back in June, and Barrel Theory's co-founder Brett Splinter gave us a tour. Here's a look inside. 

The building wasn't designed to hold all this brewing equipment, so the space needed a lot of work. But the people behind the brewery (including two Surly alums) made sure to keep the charm of the place, including the limestone and exposed wood that date back to the building's construction in around 1885.

One of the coolest parts of the space is probably the basement. The limestone-lined cellar is where the brewery stores all of its barrels for barrel-aging beers. 

And also in the basement is what may be the entryway to a Prohibition-era tunnel. Check it out above.

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