A museum dedicated to the alleged Roswell Incident.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

An architect's childhood fantasy treehouse made real.

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

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

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

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

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

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

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

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

Civil War Fort on an island in the Boston Harbor.

Civil War-era Fort designed to withstand invasion and attack, with tricky traps called "murder holes."

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.

This popular Boston haunt is reminiscent of a time gone by, when slow cafes and sweet-smelling smoke wafting from patios was the norm.

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

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

A steampunk wonderland that preserves America's history of industrial innovation.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

Second largest wastewater treatment plant in the country.

Solar powered Spectacle Island features all-green facilities.

Trash escaped from a landfill to fill beaches with all kinds of treasure.