This cemetery is all that remains of a school for "wayward" girls.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

A hidden grotto on the grounds of the Kane County Government Center.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

The final resting place of two unknown soldiers.

A onetime gangsters' hideaway where you can dine on steaks, fine wines, and cigars just like they once did.

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

Cold War missile launch site which has been converted to a public park.

This baseball diamond was home to the Rockford Peaches, a team featured in the hit film "A League of Their Own."

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

Former meatpacking facility turned vertical farm and sustainable business complex.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

The best place in New York to pick up the controversial, notoriously foul-smelling Asian "king of fruits."

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 historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

The home of the first American-born saint is one of the only curved buildings in New York.

A dilapidated dock tells the story of Titanic's missed arrival.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

A small graveyard is hidden in the midst of a bustling university campus.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.