In Rickwood Caverns, visitors can travel hundreds of feet underground and see beautiful formations unique to the region.

Since it formed millions of years ago, this cave system has been a sacred burial ground, a Prohibition-era speakeasy, and the center of an amusement park.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

The ghost town that ended up on Ebay.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

An ode to South Dakota's state fish.

The final resting place of the Hunkpapa Lakota leader Tatanka Iyotaka, commonly known by the English translation Sitting Bull.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

A fitting attraction for the corn capital of the world.

An office built to look like a giant basket.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

A true roadside icon standing on the same plains that the herds once roamed.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.

A brick-paved former section of the historic coast-to-coast highway.

A historic, scenic mill that was forced to close due to overlogging.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

Often referred to as the largest spring in America.

Nestled in Onondaga State Park, over 100 canoes carefully stacked in a replica of the famous standing stones.

Giant granite rocks standing end-to-end like a train of circus elephants.

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

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.