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

Home of mutant livestock.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

One person's lost luggage is another person's treasure.

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

This quirky curiosity shop takes its cues from the world's bazaars.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

2300-year-old Roman road connecting the empire.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

The hidden jewel of Disneyland: a members only playground for the Disney elite.

Electrical pylon in the shape of Disney's beloved mouse.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

One of America's first planned communities is preserved in a state park.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

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

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

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The remains of this visionary community can still be found much as it was a century ago.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.