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

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

The notorious headquarters of a corrupt political machine.

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

Visit the monolithic tomb of America's most famous general.

A bit of retro transportation flair preserved in the world's largest department store.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

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

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

On the Hudson resides one of the largest clocks in the world.

Vintage cars and motorcycles race for glory in a throwback motorsport celebration on the Jersey shore.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

Step inside Lucy, the world's largest "elephant."

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

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

The homestead of American patriot John Adams.

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

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."