Every time the Darke County Historical Society unearths a new finding, there’s a good chance that the public’s first look at it will come in the exhibition halls of Greenville’s Garst Museum. More than 300,000 American artifacts fill the museum's six wings, many of which were discovered—or rediscovered, as the case may be—over the course of the society's archeological digs, genealogical research, and historic preservation activities.

Among the century-spanning exhibits, the softer side of sharpshooter Annie Oakley unfolds in the Coppock Wing, and antique cannonballs and Humvees speak of the wartime exploits of General "Mad" Anthony Wayne. Down on the first floor, a painting of Chief Tarhe, Grand Sachem of the Wyandots, presides over a collection that focuses on America during the 1700s but leaves room for anachronistic elements such as mastodon bones. The newest exhibit, "Diversity in Darke County: The Story of Longtown," celebrates local history with its visual chronicle of a tri-racial settlement in Greenville.

Aside from the main two-story brick Colonial home—which was built as an inn in 1852, according to Touring Ohio—the society and the museum maintain several properties of historic note. A free, self-guided tour of Bear's Mill and its 800-foot water channel can be capped with a cup of gourmet coffee, and the Lowell Thomas house provides insights into the childhood of the broadcaster and adventurer who once famously dined with the Prince of Wales inside an actual whale.