Sand Creek Massacre National Historic Site
Place in Colorado listed on National Register of Historic Places.
Each edition grades its towns against each other only.

A day out from Hartman leads to Fort Lyon, 50 mi away. Nothing is mapped inside Hartman, but 2 places to visit are within 40 miles. Visits to Amache National Historic Site run to about 8K a year.

National Historic Site of the United States in Colorado.
The towns around it, and where to stay →
At the edge of the map sits Sand Creek Massacre National Historic Site, 31 mi out.
Orange: Hartman. Numbers: the best-known places, matching the list below. © OpenStreetMap contributors
3 places, all within 60 miles, make the list.
Place in Colorado listed on National Register of Historic Places.
National Historic Site of the United States in Colorado.
Ranked by how many people look them up, so the famous places lead and the local favorites follow.
Sand Creek Massacre National Historic Site: Plazak at English Wikipedia, CC BY-SA 3.0 · Amache National Historic Site: Tom Parker, Public domain · Fort Lyon: Jeffrey Beall, CC BY 3.0