A cave interior in the shape of the ancient rhinoceros, created by lava cooling around its carcass.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

The only Native American museum along the Oregon Trail, run by the peoples who have lived on the land for generations.

This 80.33 troy ounces of solid gold is believed to be the largest nugget from Oregon still in its original form.

Home to the deepest rift anywhere on Earth.

A creek tumbles over a series of step-like rocks to create this scenic water feature.

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

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

One man's ambition created this psychedelic log home.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

Minnesota's oldest and deepest mine is now an underground physics laboratory.

This sprawling building built in 1890 was one of Minnesota’s earliest and largest mental health facilities.

A riverside park built around the ruins of a massive dam that collapsed in 1909.

On the windswept Dakota plains there is a memorial to circus workers who were struck down by lightning.

This replica of an 8th century burial ship actually sailed to Norway before returning home to Minnesota.

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

A museum within a museum, devoted to history's most questionable medical devices.

This iconic water tower and failed bandstand is open for panoramic views once a year.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

Come for the giant taxidermy lion, stay for the knick knacks at this Minneapolis curiosity shop.

When flour explodes, it's not a pretty sight.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

When waves crash onto this section of beach, the rocks sing a song.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.