This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

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.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Try not to get slimed in Tribeca.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

D.C. once had its own tiny rival to the New York Stock Exchange.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

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

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

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

Historic Hull Street was actually the first street with a proper name in the Boston area.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The inventor of the iconic Pringles can was so proud of his invention he was buried in one.

What is it about mushrooms that makes people wish they lived inside of them?