New York City's smallest piece of private property.

The first piece of public art dedicated to LGBT rights.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

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

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

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

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

This statue of the "father of television" stands prominently in the United States Capitol.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

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

The "lovely red Vega" of the legendary record-settling pilot.

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

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

Perhaps the most scandalous statue of America's first president.

This taxidermy horse was a Civil War hero.

The most decorated dog of World War I is preserved in the Smithsonian.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.