Mysterious 500-year-old tapestries depict a unicorn hunt.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

Interactive museum complete with costumed re-enactors and the only known surviving chest from the Boston Tea Party.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

Ice cream stand, snack bar, and time capsule of milk conveyance.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

The "Seinfeld" diner.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Finally, you don't have to be a pious Swedish seaman to relax like one.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

The restored and active Victorian-era final resting place of San Francisco.

This private residence was the template for one of the most beloved television homes of all time.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

The oldest lawn bowling club in the United States.

This park built on a former fortress has a reputation for romance.