The longest of the four remaining covered bridges in Missouri.

Around 50 million gallons of water flow from this spring every day.

A sculpture for the sun and stars, created by Nancy Holt.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

This sparsely populated town offers a look back in time.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

A frozen oasis lies beneath the scorching New Mexico desert.

A starship has landed in Texas, a welcome break for weary travelers from a drab stretch of I-35.

Eat like pre-Columbian Native Americans in this New Mexico restaurant within the Indian Pueblo Cultural Center.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

This interpretive path lets you get up close and personal with dinosaur bones.

A devilishly named gorge that was a sign of salvation for many pioneers.

Known as "The Hill of the Little Devils."

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

A unique attraction and museum dedicated to exploring iconic roadside structures.

Enjoy a tour of oddities and makeshift monsters at this souvenir store with an offbeat sense of humor.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

This park straddling the United States-Canadian border has been a symbol of peace since 1932.

The pit stop from "The Texas Chainsaw Massacre" now serves beef and pork barbecue, not people.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

An exquisite grouping of structures made from 10 tons of invasive saplings.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.