The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

This historic cliffside mansion uses a natural cave for air conditioning.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

Curious cave that stays a cool 56 degrees all year long.