The king of U.S. high points towers over every other peak on the continent.

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A cave's rare beauty held a cavernous secret hidden underground.

The easiest way to the highest point in Wyoming is only accessible via one hefty fee.

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

The highest point in Washington state is a volcano covered in glaciers.

The highest point in Florida is still the lowest high point in the country.

The highest point in Iowa, while not that impressive to mountain states, has earned its own monuments.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

See six states, pickled freaks, rocks, and antiques.

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

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

America's first federal monument.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

An abandoned relic of the city's failed experiment with below ground transit.

A memorial for an outsider theorist who believed that the planet is actually hollow.

Remnants of 19th century vigilante justice.

A county library in rural Ohio houses one of the finest mineral collections in the world.

A miniature world of concrete and stone in Springfield, Ohio.

A gas station has taken the place of the home of the 19th American President.

A single handprint, which, according to Ohio State University legend, cannot be scrubbed off.