Field NotesOhio
Upper Falls in the Old Man's Cave gorge, Hocking Hills, with visitors on the rocks

An independent field guide · 365 places

The field guide to outdoor Ohio

Parks and forests, ancient mounds, caves, waterfalls and back roads, with the story behind each place and where to eat and fuel up nearby.
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  • 117parks & forests
  • 64ancient mounds
  • 34waterfalls
  • 40historic sites
  • 33road trips

Old Man's Cave, Hocking Hills · Photo: Rhododendrites, CC BY-SA 4.0

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State parks & forests117 places, with cabins, campsites and trails117 places Waterfalls34 falls, with trail notes34 falls Mounds & earthworks64 ancient sites, from Serpent Mound to Newark64 ancient sites Caves & caverns12 show caverns, recess caves and rock shelters12 caves Lake Erie beaches20 public beaches, Conneaut to Toledo20 beaches Historic sites40 places, from the frontier to the Civil War40 places Road trips33 drives, from the Lincoln Highway to the Morgan Heritage Trail33 drives Oddities19 giants, ghosts and folk-art stops19 roadside stops The Buckeye TrailA 1,444-mile loop, all 26 sections1,444 miles

New to the guide?

Six places to start

One from every corner of the state, each with its full story inside.

01Old Man's CaveHocking Hills · SoutheastA gorge of waterfalls and recess caves where a hermit is said to have lived, with the park's visitor center. 02Great Serpent MoundAdams County · SouthwestA gigantic earthen snake on a hilltop over Ohio Brush Creek, built by a people whose name is still argued over. 03Brandywine FallsCuyahoga Valley · NortheastThe tallest waterfall in Cuyahoga Valley National Park, reached by an easy boardwalk with an accessible upper overlook. 04Marblehead LighthouseMarblehead · Lake ErieThe oldest continuously operating lighthouse on the Great Lakes, lit since 1821, on nine acres of limestone shoreline. 05Zoar VillageTuscarawas County · EasternA well-preserved communal village founded by German separatists in 1817, on the Ohio & Erie Canal. 06Longaberger Basket BuildingNewark · CentralA seven-story office building shaped like a picnic basket, with handles that are heated in winter.

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Lake ErieWest Virginia36 places368 places813 places135 places523 places2321 places2124 places2416 places1613 places134 places418 places182 places217 places1710 places1014 places142 places27 places76 places613 places133 places34 places414 places143 places3Harrison Lake State Park2 places22 places22 places26 places64 places4

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Parks, forests & wildlife areas

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117 parks in 7 regions

Dayton Power and Light Company Mound

Wrightsville · Adams County · Southern Ohio
A big Adena mound inside a power plant
National Register of Historic PlacesInside a power plant
Directions →

A large Adena mound preserved on the grounds of a power plant.

Where
Inside the Killen Station power generating plant, east of Wrightsville
Rank
Some sources call it Ohio's second-largest conical burial mound, a claim that conflicts with Enon Mound's usual ranking
Believed built by
The Adena
Listed
National Register of Historic Places, 1974

The story

The Dayton Power and Light Company Mound lies inside the Killen Station power generating plant east of Wrightsville in Adams County. It is believed to have been built by the Adena, and some sources describe it as Ohio's second-largest conical burial mound, though the Enon Mound is more often given that rank. It was added to the National Register of Historic Places in 1974. It sits on industrial property, so it is not open to visitors.

Related sites

Visiting information you can trust

Check before driving — this site is seasonal, approximate, privately run, or otherwise uncertain. Confirm hours and access with the official source above.
Content last reviewed
September 2026 — this is when Field Notes Ohio's content was last checked, not a live status.
Location confidence
Approximate — boundary or exact point not confirmed
Use the listed address for directions; treat the map pin as a general area.

Prices, hours, closures, campsite availability and trail conditions shown elsewhere on this page are not live — always confirm with the official source before you go.

The Mound Inside the Power Plant

Adams County has the Serpent Mound, and it also has a burial mound inside a power station. The mound is big enough that some sources call it the second largest cone in Ohio.

It has survived because the land around it belongs to a company that has kept it.

Behind the legend

The ranking is disputed: the Enon Mound is the one usually called Ohio's second-largest conical mound, and no measurements are given for this one in the sources available. The mound's listing and its location are documented.

If you go

You cannot visit it, but Adams Lake State Park and the Serpent Mound are nearby in the same county.

Visiting

Status
Not open to the public
Managed by
Private power plant
Hours
The mound stands within an industrial site and is not open to visitors.
Please note
Not accessible.

Parks nearby

Adams Lake State Park
About 12 miles · The closest state park, in the same county.
Open

Details last checked 2026-09-22. Confirm hours and prices before you go.

Know a place that belongs here, or spotted something out of date? Email hello@fieldnotesohio.com.