The most decorated dog of World War I is preserved in the Smithsonian.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

To find the "unicorns of the deep" you've got to go downstairs.

The world's longest known cave system.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

This historic hotel invented the chocolate brownie.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This church houses the “incorrupt” body of its founding Bishop.

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

One Confederate statue that accurately reflects the ugliness of its subject.

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

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

Elvis's own personal tropical hideaway.

The small cave that housed Tennessee's "first citizen."

This award-winning men's bathroom was just too beautiful to not allow women to see.

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

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

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

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

The secret city built by the Manhattan Project.