Once the largest windmill outside of Holland, with enormous 114 foot sails.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Elvis's own personal tropical hideaway.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

A contemporary fresco movement illustrates the region's rich history.

A tribute to Rhode Island's state bird, a domesticated chicken breed that dominated the 19th-century poultry industry.

The only boathouse Frank Lloyd Wright ever designed was also the only unbuilt structure in his famous Wasmuth Portfolio, until 2007.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Soaring over the Niagara Whirlpool since 1916.

This historic fort spans more the 300 years.

One of the word's deepest gorges is also tied to a fantastic legend.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

The greatest real estate coup of all time.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

This was one of the first (and last) university-built and operated nuclear reactors.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

In 1986, Keith Haring was arrested for painting this anti-drug mural on a Harlem handball court.

The site of a fallen tree that protected Americans from British forces during the American Revolution.