The Round Barn (Gilmore Barn) - Credit: Wikimedia Commons
The Round Barn (Gilmore Barn) is a historic octagonal barn located near Ash Grove, Greene County, Missouri. The Round barn now serves the community as a unique event venue http://www.theroundbarnmo.com/. It was built circa 1899, and is a three-story limestone bank barn, 70 feet in diameter, with interior post and beam framing. The roof is in cone sections topped by an octagonal cupola. (includes 7 photographs from 1993) Read more on Wikipedia
Source: en.wikipedia.org