Possible relics of the ancient Roman city are hidden in this restaurant's façade.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

There must be a pun in this haystack somewhere...

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

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

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

There’s a hidden military meme engraved on the World War II Memorial.

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

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

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

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

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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