Entrance to Donaldson's Cave in Spring Mill State Park.

Aerial view of Esterline Angus Instrument Company in Speedway, Indiana.

Workers in Esterline Instrument Plant.

Interior of Esterline Angus Instrument Company in Speedway, Indiana.

Interior of Esterline Angus Instrument Company in Speedway, Indiana.

Fallen suspension foot bridge near Emericksville Bridge in Indianapolis, Indiana.

Flowing well north of Indianapolis.

Courthouse tower in Greensburg, Indiana. The tree growing at the top of the tower was first noticed in the 1870s.

Hamer's Mill at Spring Mill State Park, Mitchell, Indiana.

House in Brown County.

Indiana Limestone Quarry in Bedford, Indiana.

Indiana Limestone Quarry in Bedford, Indiana.