The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The remains of the iconic train crash from the movie 'The Fugitive' can still be found rusting along the Great Smoky Railroad.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

The only arched bridge made of stone on the entire Mississippi River.

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.

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

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

A statue honoring 44 continuous years of greeting passing ships.

A sweet tribute to Georgia's official state vegetable, which even has its own mascot: "Yumion."

This kitschy tavern is also home to rare early editions of "Treasure Island."

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

FDR hoped to find a cure for polio in this Georgia town's warm springs.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

This 13-foot smiling peanut in Georgia helped Jimmy Carter win the 1976 presidential election.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

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

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

An exotic wildlife habitat right off The Strip.