More than 700 species live within this murky marvel of a swamp on California's coast.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

A mysterious stone embedded at the base of a historic Boston building.

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

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

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Pizza with a side of fine art.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

Banksy gives themself artistic license with this piece of London street art.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

"Mock all and sundry things, but leave the saints alone."

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

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

Narrowest house in Boston.