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Door Prairie Horse Barn
The Door Prairie barn in LaPorte, Indiana was built in 1882 and is the last example of a nine-sided barn in the country (and possibly the world). Nine pie-shaped stalls extend from a central feeding silo that extends up to the cupola. Chutes carry the silage down to each of the stalls to feed the horses. While this barn looks rather small when you pass by, it's really large when you stand next to it.
No longer used to keep horses, this barn is listed on the National Register of Historic Places, and is owned by Peter Kessling, an antique car enthusiast who built the Door Prairie Auto Museum next door in 1993, only to donate the building to the county of LaPorte to house the county museum.