One of the smallest towns in the United States.

The largest source of fossilized insects anywhere.

An unusual geological feature towers over the remains of a dark episode in United States history.

One North Dakota man's vast collection of rare rocks, polished orbs, and geological wonders.

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

Native Americans built this circle of stones, which was used to predict astronomical events.

Operational for less than a year, this mill produced more than 11,000 tons of chrome concentrate in its short lifespan.

The oldest still-existing mosque in the United States sits in a remote prairie in North Dakota.