Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

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

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

A collection of huge Pre-Colombian structures in Alabama.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

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.

Follow the steps, and this roadside artwork will teach you how to dance.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

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

An abandoned town is hidden in Great Smoky Mountains National Park.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

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.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

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

Mile-long cave system near Great Smoky Mountains.

The secret city built by the Manhattan Project.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.