Little Bighorn Battlefield National Monument
American National Monument.
Each edition grades its towns against each other only.

Of the 7 places to visit in and around Pompeys Pillar, 4 are parks & monuments. All of them lie outside Pompeys Pillar. About 228K people a year visit Bighorn Canyon National Recreation Area.

Route across the United States commemorating the Lewis and Clark Expedition.
The towns around it, and where to stay →
The map ends at Bighorn Canyon National Recreation Area, 39 mi out.
Orange: Pompeys Pillar. Numbers: the best-known places, matching the list below. © OpenStreetMap contributors
Look within 60 miles for all 7.
American National Monument.
Route across the United States commemorating the Lewis and Clark Expedition.
National Recreation Rrea in Montana and Wyoming in the United States.
Ranked by how many people look them up, so the famous places lead and the local favorites follow.
Parks and trails in Pompeys Pillar →
Little Bighorn Battlefield National Monument: 1025wil, CC BY-SA 3.0 · Lewis and Clark National Historic Trail: United States Army Center of Military History, Public domain · Pompeys Pillar National Monument: BLM photo, Public domain · Bighorn Canyon National Recreation Area: National Park Service, Bighorn Canyon National Recreation Area, Public domain · ZooMontana: Montanabw, CC BY-SA 3.0 · Yellowstone Art Museum: Clyde Charles Brown, CC BY-SA 4.0 · Western Heritage Center: Unknown authorUnknown author, Public domain