The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

The first KFC is on the National Register of Historic Places.

The world's longest known cave system.

Two gushing waterfalls of hot spring water within a block of each other.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

The only diamond mine in the world where you can keep what you find.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

A visionary oral narration project brought new life to Jonesborough.

A group of monuments to the Cherokee origins of Tennessee.

Waterfalls, rapids, and top-notch swimming spots await in this densely forested corner of the Smokies.

Stroll around the headstones of notable figures from Knoxville's history, as well as towering monoliths and melancholic headstones.

This 19th-century building inadvertently preserved the handprints of its builders within its walls.

The 10th-tallest pyramid in the world, this former sports arena is now home to a massive Bass Pro Shops store.

The site of the Scopes Trial contains a small exhibit dedicated to the famous case.

This stone memorial pays tribute to a massive shipwreck which was sadly overshadowed by the death of John Wilkes Booth.

An ode to "The Queen of Appalachia."

The world's largest version of this iconic puzzle cube is located in Knoxville, Tennessee.

A roadside music shop featuring a confounding series of folk art installations.

This museum pays tribute to the Cherokee leader who created a written language for his people.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

A bronze sculpture honors the 12 black students who attended the first integrated public high school in the segregated South.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

One man’s religious convictions led him to build this stone castle meant to withstand an apocalypse.