The former home of Samuel Clemens and family remembers the happiest period of the author's life.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

Odd, decrepit fountain honors Chicago author who had mixed feelings about his hometown.

Illegal drag racing two stories beneath Chicago’s streets.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Home to a protest movement, a bombing, and a dramatic change in labor history.

A display of magnificent stained glass windows is the first exhibit of its kind.

This historic hotel invented the chocolate brownie.

A hollow cement depiction of time's inexorable effect on the human body.

An antiquated German apothecary on Chicago's North Side.

A lush green oasis in the middle of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Largest Roman Catholic church in North America.

Home to a vast and influential collection of Shakespeareana.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Home to items never before seen by the public.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

The national park was once a plantation estate.

It was once the base for a series of domestic terror attacks.

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