An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

This grand gothic brewery has been pumping out suds for over a hundred years.

Unusual books about food and drink abound in this 19th-century New York townhouse.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

The first piece of public art dedicated to LGBT rights.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

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

This New York holdover was built to provide housing for shopgirls and still does not allow men above the lobby.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Come for the waffles, stay for more waffles.

New York's oldest magic store.

An extensive collection of fine art devoted to man's best friend.

This semi-hidden Manhattan restaurant is based out of a loading dock.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

An unassuming secret door once led to a legendary watering hole.

A quick trip around the globe through an amazing miniature exhibit.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

This speakeasy continues the Prohibition-era legacy of Harlem's jazzy Swing Street.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

The "Seinfeld" diner.