The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

A clear blue swimming hole with hidden caves, still unexplored.

A Memphis park where you can walk the whole Mississippi River in one go.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

What better place to take a seat?

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

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

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

This simple, broken column marks the final resting place of one of America's most famous explorers.

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.

This replica of the Greek structure is in the heart of Nashville.

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

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

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.

This historic Victorian hotel has a scandalous history of affairs and murder.

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

A bizarre roadside attraction and the first instance of miniature golf in the world.