Largest gathering of hobos in the country has been meeting annually since 1900.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

This little barrel-shaped cottage by Lake Superior was once a cartoonist's summer retreat.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

A miraculous natural phenomenon known as "the spring that breathes."

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.

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

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

Tirelessly maintained by a Wisconsin man named JFK.

A Buddhist temple to honor insects that died for science.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

A gargantuan crystal kingdom.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

These eerie outliers of the lightning bug family glow a mysterious blue color.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

One of the best places in Florida to spot rare, carnivorous pitcher plants.