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

Huge masonic hall in Philadelphia with lavishly themed rooms.

World's first "penitentiary," meant to be humane, drove men insane.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

"Gnome Chomsky" was once the largest gnome in the world, but is now simply tall for his kind.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

An unrealized dream to wirelessly electrify the entire Earth.

Mysterious rocks that ring musically when struck.

The intriguing personal collection of a professional demon-chaser.

Whimsical artist house in the New Jersey woods.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The site of one of history's most indelible and horrific tragedies.

Mansion and shopping center used in the 1975 film "The Stepford Wives."

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

A historic grist mill and active sluice on the Black River.

Creaky dinosaurs grow in the backroads of Monmouth County, New Jersey.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

A whimsical monument deep in this park commemorates the groups that helped build it.

A tiny islet just off Long Island offers a wealth of infectious curiosities.

Final resting place of two dozen New York City harbor ships.