One man's swirling six-acre monument of stone.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

The highest point in Wisconsin is capped by two towers that are not as mythic as Tolkien's but provide much better views.

The highest point in Virginia can only be reached by passing through ponies and flowers.

The highest point in South Carolina was once owned by an energy company that neglected it but now the state is taking it back.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

The highest point in Oklahoma used to be a lawless outlaw's paradise.

In this relatively flat state the highest point is an honored place.

Roaming bison and a spectacular view at the highest point in Nebraska.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

This small museum is kept in a house that was integral to the genesis of Uncle Tom's Cabin.

Thousands of jack o'lanterns light up Halloween at this historic West Virginia home.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

Shop of curiosities with a dinosaur museum tucked in its basement.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Only known mainland rookery of the threatened Stellar sea lion.

Visit this playground of waterfalls, caves and sinkholes.

Enormous lake at the bottom of a unique cave system.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.