The last of its kind in the country.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

An eccentric inventor's castle home with its own indoor weather system.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

The only diamond mine in the world where you can keep what you find.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

Visit this playground of waterfalls, caves and sinkholes.

The longest living non-clonal organisms on Earth.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

An inconspicuous footbridge beloved by San Diego locals.

A popular swimming hole that hides one of America's most deadly diving spots.

A wall of chewing gum moonlights as collective art.

A giant 400-acre preserve in North Florida for displaced wolves.

Nondescript elevator doors open to reveal a stunning, surreal world.

The oldest surviving synagogue in New York City is now a soaring art space.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One man's ambition created this psychedelic log home.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

A ghost town at the airport is now a refuge for blue butterflies.