National Historic Landmark · Chillicothe, Ohio

Adena (Thomas Worthington House)

Added to the National Register in 1970, and a National Historic Landmark.

Adena (Thomas Worthington House)
Photos via Wikimedia Commons

The record

Property typeBuilding
AddressBox 831 Adena Rd., Chillicothe, OH
CountyRoss County
ListedNov 10, 1970
Listed forLandscape architecture, Politics and government, Architecture
Level of significanceNational
Also known asMount Prospect Hall
Reference number70000515
DesignationsNational Historic Landmark

The nomination form, the document that argues why this place matters, is in the National Archives: Read the nomination ↗

Visiting

AddressBox 831 Adena Rd., Chillicothe, OH
Coordinates39.3550° N, 83.0136° W · Directions ↗
Also in Chillicothe23 listed places in Chillicothe →
Listing on the Register does not open the door. Unless a museum or park runs it, treat this as private property and see it from the sidewalk.

Explore

Map

Local history books for Chillicothe and Ross County

We earn a small commission if you buy through these links. It does not change what we list.

Guidebooks to historic places and travel in Ohio

  • A guide to historic Marietta, Ohio
    Lynne Sturtevant, 2011
    Find at Bookshop.org
  • Ohio off the Beaten Path®
    Jackie Sheckler Finch, 2024
    Find at Bookshop.org
  • Cincinnati Haunted Handbook
    Jeff Morris and Michael Morris, 2025
    Find at Bookshop.org

Titles come from Open Library's catalog, matched by subject heading or by title.

Reference

Questions people ask

When was Adena (Thomas Worthington House) listed on the National Register?

Nov 10, 1970. It is also a National Historic Landmark, the higher of the two designations.

Source: National Park Service

Where is Adena (Thomas Worthington House)?

Box 831 Adena Rd., Chillicothe, Ross County, Ohio.

Source: National Park Service

Where is the nomination form for Adena (Thomas Worthington House)?

The National Archives holds the nomination form, the document that made the case for listing.

Source: National Archives

Sources

Name, location, type and dates come from the National Register office's spreadsheet of listed properties, because the Park Service's spatial data does not carry this listing. The map point comes from Wikidata. Construction date, architect, style, photograph and encyclopedia link come from Wikidata and Wikimedia Commons, matched on reference number 70000515. Nothing here is transcribed by hand. The nomination form and photographs ↗ at NPGallery are the original nomination as filed with the National Park Service, and the form is often the best description of the place.