A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Join in a Seance at the Swedenborgian Church.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A bit of retro transportation flair preserved in the world's largest department store.

A dilapidated dock tells the story of Titanic's missed arrival.

A journey along this trail means indulging in a slice of nostalgia.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.

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

Dedicated to a U.S. Army lieutenant colonel who was also a bird watcher and artist.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

This homestead was occupied by Union soldiers, who believed the owners were signaling Confederate forces.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

A completely underwater art museum sends a stark message about humans' impact on the environment.