A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

This spectacular track has run continuously since 1882.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This enormous censer uses a pulley system installed over 400 years ago.

Legends surround this jagged rock formation in the New Mexico desert.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Despite its name, this route in southern Utah offers a heavenly day trip.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

Home to the deepest rift anywhere on Earth.

A bronze replica of half-consumed salt lick honors a quirky town tradition.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

A former gold rush boomtown has managed to stay in business for over 100 ramshackle years.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

Jail from the 19th century that was built by inmates.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

Boise State's stadium was the first non-green football field in the world.