The Thomas Ranck Round Barn was listed on the U.S. National Register of Historic Places in January 1983.

It is part of a complex of buildings on the southeast portion of the McDivitt property in Brownsville, Indiana.

McNammee built several round barns in the area, and patented his design for a self-supporting conical roof in 1905.

[3] The Ranck farm was purchased in 1937 by a local veterinarian and his wife, Ralph and Tena Carmack.

With the exception of some timbers on the lower level, no structural member is more than 2.5 inches (6.4 cm) thick.

At this level the main drum has studs with rhythmically spaced angle bracing reaching to the upper first roof plate.

[3] An earthen ramp slopes up to the main entrance for the upper level on the west side.

In the cupola, square, louvered vents]] have replaced the windows, which were the same shape as those at the loft level.

Divided by wood partitions, the floor serves as a storage area for equipment and supplies.

[2] The barn features two rows of clerestories set between round lantern conical roofs which decrease in size with height.