Remnants of a large limestone kiln in what, in the 1870s, was the "company town" of Hurtsville, near present-day Maquoketa in Jackson County, Iowa -- an area laced with caves and high limestone bluffs. One finds dozens of substantial limestone-block buildings throughout the county. The kilns heated limestone rock mined from nearby quarries to form lime mortar used in building construction. This production of lime from native stone became one of Iowa's most important early industries. A large community effort and volunteer labor went into restoration of the four lime kilns. Photo by Carol Highsmith, 2016.