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

This abandoned Victorian-style house was built in 1884.

This impeccably preserved farmstead is a time capsule of a Pulitzer Prize-winning novelist's life.

Once luxurious, these oceanfront beach homes have been left to succumb to the elements as the beach is slowly washed away.

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

A small brick parlor house and artist's studio located in the wilderness is surrounded by imposing suburban palaces.

The former home of Thomson Francis Mason, the mayor of Alexandria from 1827-1830.

This Georgian-style house built in 1746 is the oldest surviving structure in Bladensburg.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

Given just one more year to live, Conrad Schuck built his dream house in Bartow, Florida.

This free, take-a-book shop seems like a trick but isn't.

This methodist cemetery is slowly receding into the wilderness along a Maryland highway.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

This small Key West museum is packed with dozens of artifacts that illustrate the life of the iconic playwright.

The highway's southernmost spot is a beloved local attraction.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

The island residents are known for taking their quirky sense of humor with them to the grave.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.