Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A vertically floating hemlock controls the waves and weather at Crater Lake.

A nearly 200-year-old Catholic mission built to serve the native people of Idaho.

An Egyptian-revival style film house in Boise, Idaho.

An Idaho legend carved out a cave village with his own two hands.

This hulking rock formation balances on a pedestal that is 3 feet by 17 inches.

This U.S. natural reserve is an ancient spiritual place and rock climber’s paradise.

A former sanitarium where soldiers were sent to recover in the healing waters of hot springs.

While it is not equipped to peer into outer space this observatory looks like it was built on the moon.

This coastal rock formation resembles a churning cauldron at high tide.

This historic bridge connects Whidbey Island to Fidalgo Island across whirlpool-filled waters.

A large wind turbine installation in central Washington State is home to an extensive set of interpretive exhibits.

A former railroad trestle over Interstate 90 has been refurbished for non-motorized traffic on the Palouse to Cascades trail.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

This rustic old building is said to be the most photographed barn in America.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

This town is home to the world’s largest arch constructed entirely of elk antlers.

A giant sculpture dedicated to a staple of South Bend food culture.

Supposedly Satanic numbers adorn this preserved submarine sail.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

This combination shop and museum is filled with curious items and artifacts.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

You can dig for your own 52-million-year-old fish fossils.