The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

New York's oldest magic store.

The ornate miniature mansions were built for Istanbul's feathered residents.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

Who knew the Devil's domain was a hot spot for tubing?

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

An eccentric playboy's astounding natural history collection.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

This rickety old shed hides a trove of secondhand literary treasures.

At less than four inches in height, this iconic fictional character is the smallest public statue in all of Moldova.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

The "lovely red Vega" of the legendary record-settling pilot.

A historic neighborhood church is reborn as a psychedelic arts collective.

Home to items never before seen by the public.

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