| Ruins |
| Alabama | Florida | Louisiana | Nebraska | Oklahoma | Vermont |
| Alaska | Georgia | Maine | Nevada | Oregon | Virginia |
| Arizona | Hawaii | Maryland | New Hampshire | Pennsylvania | Washington |
| Arkansas | Idaho | Massachusetts | New Jersey | Rhode Island | West Virginia |
| California | Illinois | Michigan | New Mexico | South Carolina | Wisconsin |
| Colorado | Indiana | Minnesota | New York | South Dakota | Wyoming |
| Connecticut | Iowa | Mississippi | North Carolina | Tennessee | |
| District of Columbia | Kansas | Missouri | North Dakota | Texas | |
| Delaware | Kentucky | Montana | Ohio | Utah |
| Wisconsin |
| Feature Name | County | Class | Latitude | Longitude | 1:24,000 USGS Topographic Map |
Elevation in Feet |
Feature ID# |
| Berkshire Mine Ruins | Ashland | Locale | 461804N | 0903726W | Mount Whittlesey | 1654 | 1561599 |
| Marshall | Dane | Populated Place | 431006N | 0890400W | Marshall | 879 | 1569082 |