Out of a labyrinth of abandoned tunnels and stops, this Queens subway station is arguably the most mysterious—if it exists at all.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

An ode to Japanese artist Hokusai, with a bit of a comical twist.

The first of Lancaster's "rural cemeteries."

This iconic Lancaster everyman has been reading the same story since 1980.

The oldest farmer's market in America is so ancient it was approved by the King of England.

This bank is widely believed to be the inspiration for the offices of Philip Marlowe, the hardboiled detective featured in a number of Raymond Chandler's stories.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

Built for an exposition in 1915, these horticultural displays have stood the test of time.

A touching tribute to the "Queen of Soul."

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

This Garden District mansion was built to be bigger and grander than its original owner's former partner turned rival.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

Dedicated to the explorer who opened Japan to the West.

Metal sculpture folk art lining the Kansas Highway.

Created by Catalan artist Joan Miró in 1978 and made up of 350,000 tiles, this mural is the only large-scale glass mosaic the artist ever created.

The first "Hut" was actually a small brick building.

Undone by Prohibition, this abandoned brewery-turned-flour mill is now ready for its third act.

The only subway station in the city that still makes use of gap fillers.

Community bookshelf of 25-foot-tall book spines.

This recently restored timepiece has stood all around Kansas City.