Workers at power plant in Crawfordsville, Indiana.

Workers at the Esterline Company in West Lafayette, Indiana.

Big Four Bridge in Louisville, Kentucky.

Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Powerhouse for Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Powerhouse for Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Powerhouse for Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Fort Harrod, built in 1777, was part of the first permanent settlement west of the Alleghenies in Harrodsburg, Kentucky.

Grave of the first white child buried in the oldest town in Kentucky-- Harrodsburg.

High Bridge spanning the Kentucky River from the Dix River.