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

An acoustic anomaly with a mysterious cause.

A half-size replica of the World Trade Center towers above Tulsa.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

A wealth of local folk art, antiques, and curios, without ever leaving your car.

A local landmark with generations of spraypainted messages, and more being added each day.

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.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

A provocative museum dedicated to the genre and the harsh realities that inspired its origins.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

A hidden oasis just two minutes from downtown Atlanta.

Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.

A museum and doll store featuring a surreal and super sanitized version of where babies come from.

Bad farming practices caused this unnatural natural wonder.

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

An elegant Georgian cemetery best known for the grave of the little girl whose murder on Christmas Day remains unsolved.

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

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

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

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

Like Mars, but much closer.