Ruins of an American Civil War iron forge still survive today.

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

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

A chapel built by Italian POWs during World War II tells a forgotten tale of the war on the home front.

The evolution of recreational vehicles and motorhomes is on display in the “RV capital of the world."

This unassuming home was once “grand central station” for the Underground Railroad.

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

The only freestanding table rock formation east of the Mississippi.

The first spinning jail built in the United States is the only one that still turns.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

Display that gathers the basic elements of the universe in one convenient location.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

A key producer of charcoal iron in the early 1800s, the structure still stands today.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This historic train station has been converted to a locomotive themed hotel.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The first full-scale tunnel built in America is short but scenic.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

Live long and prosper in Tennessee.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.