A spooky defunct railroad tunnel now part of a sprawling trail.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

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

Admire the art and then buy a raccoon skull cleaned by flesh-eating beetles.

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.

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

These curious caverns have been home to mushrooms, gangsters, and disco.

Half of a waterfall goes into the river while the other half seems to disappear.

This large midwestern cavern features impressive rock formations and an underground waterfall.

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

This work of art by Matthew Mazzotta resides in this park dedicated to the first black legislator in Idaho.

An impressive waterfall nestled in the cliffs of Idaho's Snake River Canyon.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

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

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

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

This set of hot springs also comes with fantastic views.

Supposedly Satanic numbers adorn this preserved submarine sail.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

These century-old beehive-shaped kilns were built to produce charcoal for nearby mines.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

The cliff and rock formations are made out of Sioux Quartzite.

Known as "The Hill of the Little Devils."