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.

Nothing is mapped inside Lamar, but 3 places to visit are within 40 miles. They include 2 national historic sites and a landmark. Some 8K visitors a year come to Amache National Historic Site. For a longer trip, Bent's Old Fort National Historic Site lies 44 mi away.

Place in Colorado listed on National Register of Historic Places.
The towns around it, and where to stay →
Out at 32 mi is Sand Creek Massacre National Historic Site, the farthest.
Orange: Lamar. Numbers: the best-known places, matching the list below. © OpenStreetMap contributors
All of it lies within 60 miles: 5 places.
Place in Colorado listed on National Register of Historic Places.
1833 fort located in Otero County, Colorado, USA.
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 · Bent's Old Fort National Historic Site: unknown NPS photographer, Public domain · Amache National Historic Site: Tom Parker, Public domain · Fort Lyon: Jeffrey Beall, CC BY 3.0 · Koshare Indian Museum: Ammodramus, CC0