This rustic old building is said to be the most photographed barn in America.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

This impressive Boston holy house is the American mecca for Christian scientists.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

Artifacts of whaling, with both its perils and adventure, are housed in this museum in a former candle factory.

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

The massive machine creates cracking displays of indoor lightning.

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

Impossibly life-like natural history models created out of glass by a father and son.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

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

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

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

Two thousand artifacts from around the world collected by one woman who loved to travel.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

Three prestigious academic collections come together to create a world-class natural history museum.

Dim sum, served in a grand old theater.

Known as one of the most climbed mountains in the world, this barren peak is permanently bald thanks to an anti-wolf fire.