Constructed over 150 years ago, Barn Attic’s unassuming exterior announces little of the experience awaiting all who step inside. It began as The Barn Auction, a joint venture between Mary Lou Richards and her father, Marvin Knechel. But in the early 1970s, Richards began building what is now a four-story marvel, attracting visitors from all over the world. The Barn Attic is far more than just another vintage and antique shop. Sitting side by side with the abundance of items that typically fill the shelves of similar shops are truly…