Harlan County Nebraska has 7 places on the National Register of Historic Places including 3 places of Statewide significance. Significant places include Prairie Dog Creek Bridge, Sappa Creek Bridge and Turkey Creek Bridge, Alma Carnegie Library and Alma City Auditorium and Sale Barn.
Some of the country's most noteable architects helped create the Harlan County places including Jones & Laughlin Steel Co., Monarch Engineering Co., Milwaukee Bridge Co., Canton Bridge Co. and Illinois Steel Co.. Prominent architectural styles found in Harlan Country are .