The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Opened in 1956, the first modern indoor shopping mall in the world was inspired by the shopping arcades found in European cities.

This path is named for a mythical half-boar, half-deer creature that once roamed the Green Mountains.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

The only Native American comic shop in the world.

Train cars and railroad artifacts abound at this restaurant devoted to railway history.

The world's oldest soul food restaurant is also one of its best.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A plaque and memorabilia collection mark where A&W got its start.

At this 1940s-era neighborhood favorite, you can still drink a cherry phosphate.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

One man built this massive wall to keep his neighbor from complaining about working on Sundays.

One person's lost luggage is another person's treasure.

Hidden in the New Mexico desert southeast of Roswell, nine small deep lakes formed inside sinkholes.

An antique store houses the last operational diner from the defunct department store chain.

Hidden on the 7th floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

Rippling sand dunes frozen in the Arizona rock.

From the Difference Engine to the Cray-1, all under one roof.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

A breathtaking 19th-century trail overlooks Lake Tahoe.

An eerie site of reverence for those who have completed an epic journey.