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

An early life spent in this "Old Kentucky Home" inspired the writings of North Carolina's most famous novelist.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

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

One of the last remaining venues on the Old Chitlin’ Circuit is a kaleidoscopic music hall at the end of a dirt road.

“The Cajun Music Capital of the World” has kept things French in a Louisiana prairie town for over 75 years.

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

After the oysters have been shucked, and the restaurant's been shuttered, the terrazzo sidewalk from the 1940s is all that remains.

This strange, small castle on the bayou has withstood the test of time and weather.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

This Art Deco airport was once deemed “the air hub of the Americas.”

Some of the best pastries in "the Czech heritage capital of Texas" come from a gas station off I-35.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

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

An Irish Memorial commemorating those who perished due to potato blight.

This beloved marketplace mascot poops money and grants good luck.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This elaborate towering structure was once famed for its revolutionary height.

The first American department store, and home to the largest operating musical instrument in the world.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).