These stairstep locks, among the best preserved in Ohio, were part of the Miami and Erie Canal System, which opened for navigation in 1845 and connected Cincinnati and the Ohio River to Toledo and Lake Erie. For several decades the canal provided Ohio with valuable transportation and waterpower. Railroads gradually rendered the canals obsolete. The lockmaster's house, now a private residence, and a dry-dock basin for boat repair are still visible. Five locks step down to Loramie Creek where the abutments for the aqueduct remain.

The site is open to the public.

Website does not specify any interpretive services available at the site.

Leo Petroglyph is an outstanding example of prehistoric Indian inscriptions. On the edge of a ravine, the sandstone petroglyph contains 37 incised drawings of humans, animals, and human and animal footprints. It is now protected by a roof and viewing platform. The carvings, whose meaning is unknown, are attributed to Fort Ancient Indians who occupied this area between AD 1000 and 1650.

The site is open to the public.

Website does not specify any interpretive services available at the site.

Buffington Island commemorates the only significant Civil War battle that took place on Ohio soil. Here a Union army routed a column of Confederate cavalry commanded by General John Hunt Morgan in 1863. A monument made of broken Ohio glacial boulders is set in a four-acre outdoor park where visitors can enjoy picnics and read the signs describing the history of the area. It is not on an island.

Website does not specify any interpretive services beyond signage offered at the site.

A small granite marker identifies this site as the approximate location of the July 13–14 campsite of the 1863 Sibley expedition.

The site is open to the public.

Website does not specify any interpretive services available at the site.

This Memorial commemorates the 1834 settlement at Norway, Illinois—the first permanent Norwegian settlement in the Midwest.

Website contains no specific information about interpretative services offered at the site.

The Governor Horner State Memorial honors Henry Horner (1878–1940), who served as Illinois's 30th governor.

Website offers no information about interpretative services at the site.

Huff Indian Village State Historic Site is a classic prehistoric Mandan settlement dating to about AD 1450, perhaps 200 years before Euroamerican influence reached the Missouri Valley area. The village is a very large, well-planned community where perhaps a thousand or more people once lived. Huff Village was probably occupied only for a short time (perhaps 20 years), as indicated by the clarity of the village plan and lack of evidence for rebuilding and trash accumulation. The site is in pristine condition, and the community layout is easily seen on the surface. Depressions marking the locations of more than 100 lodges are arranged roughly in rows, paralleling the river bank. The entire settlement is surrounded by a massive fortification system consisting of a ditch more than 2,000 feet long with 10 well-defined bastions. The village, including its fortifications, covers about 12acres.

The site is open to the public.

Website does not specify any interpretive services available at the site, beyond signage.

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This site marks the location of a sod-wall protective enclosure hastily constructed by an 80-wagon party and their cavalry escort. They were attacked by Sioux Indians while en route to Montana gold fields in September 1864 and stayed corralled within the six-feet-high and two-feet-thick walls for 14 days until rescued by a column of troops from Fort Rice. There is a marker on the site.

The site is open to the public.

Website does not specify any interpretive services available at the site.

The Agency operates over 60 historic sites and memorials. The Agency also administers the Abraham Lincoln Presidential Library and Museum.

The agency offers conferences and educational programs.

Umbrella organization, operating 60+ historical sites.