Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

World's largest collection of serial killer artwork and other macabre exhibits.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A terrific purveyor of natural history objects and curios.

Reverend Jen's unique museum/living room showcases her troll collection.

On the top floor of an upscale department store stands a lavish restaurant housed in a replica of a luxury French dining car.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

New York City's first Modernist house.

A memorial marks the library lobby where Langston Hughes' ashes are buried.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

The former sign of this immortal music venue is just that--undying.

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

The famous facade of Grand Central Terminal hides a regulation tennis court, and it's not the first one.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

This nostalgic blast from the grooming past is also a working barbershop.

Those belting out show tunes might not realize this piano bar marks the site where Thomas Paine died in 1809.

This 220-year-old house is a reminder of New York City's Dutch past.

Red frames showcase remnants of one of New York's original subway stations.

Amid the marketing blitz of modern Times Square is an elegant holdover from its showbiz glory days.

Finally, you don't have to be a pious Swedish seaman to relax like one.

The first museum in the United States dedicated entirely to posters.

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

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.