The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The only Leonardo Da Vinci painting in the Western Hemisphere.

Used as a military post in three different engagements, this fort has remained incomplete and unfired upon for nearly 200 years.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

The former hotel where Tesla invented the radio.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

A pair of 7-foot legs belonging to the military man of the Mayflower stand jauntily by the side of the road.

This large granite seal outside a Massachusetts funeral home comes with a surprising dedication.

The world's largest collection of historic U.S. military naval vessels.

A coastal rock outcrop with mysterious inscriptions variously attributed to Native Americans, Portuguese, Phoenicians, Norse, and more.

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

Founded in 1788, this Rhode Island institution is the oldest operating general store in America.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

The hill that gave the Massachusett tribe, and later the state, its name.

The world's only surviving heavy cruiser has a haunting history.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

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

Dedicated to a colonial woman who was hanged for being a Quaker.

The Boston square dedicated to the dark poet who was born nearby.

After decades of neglect, a brutalist icon is getting new life as an eco-friendly hotel.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

These items are all that remain from the room used by the author during his second tour of the U.S.