Scottsbluff

Agate Fossil Beds National Monument
301 River Road, Harrison
+1 308 668-2211
Free
Daily dawn until dusk; Visitor Center: Memorial Day-Labor Day - Daily 8AM-6PM; Off Season - Daily 8AM-4PM; Closed Christmas, New Years, and Thanksgiving

Fossils of ancient mammals, Native American history, hiking. There is no camping at the monument, so if you're visiting there, seek lodging in Scottsbluff.

Chimney Rock National Historic Site - about 25 miles southeast of Scottsbluff off SR 92.