Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

The loneliest island in New York.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A natural gas leak provides a flickering flame beneath a waterfall.

A once grand hotel is being retaken by the wilderness it once capitalized on.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

A hip bar decorated with walls of golden skulls.

This small shop walked so America could run on Dunkin'.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

A museum dedicated exclusively to the lore and history of ouija boards.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

During segregation, this Orlando hotel hosted performers like Ella Fitzgerald and Louis Armstrong. Now it's a museum dedicated to preserving local Black history.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

An unassuming corner inside downtown Orlando's library offers a whole new world of the park and its history.

Over 60 chemical plants and oil refineries sit in a 15-mile-wide section outside town.

This resort community was known as the "Black Eden of Michigan."

One of the few working locomotive roundhouses in the United States.

This 19th-century ghost town offers a stunning view of Lake Michigan and a journey through the region's industrial past.

Egyptian Revival obelisks still rise over the old mine shafts.

The plants form a living library and laboratory for researchers and students at Michigan State University.