A wonderful collection of all things Oz is nestled in the heart of Kansas.

Location of a reliquary containing bone fragments of 18 saints.

An eclectic treasure trove of maritime marvels.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A popular European tradition makes its way to the states on one of America's most famous bridges.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

A celebration of capitalism in Midtown.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

A line of blue paint marks the route of the inaugural parade.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

An overlooked memorial honoring the local Washington residents who died in World War I.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

Washington's iconic carousel has a nice piece of Civil Rights history.