Surrounded by industrial sprawl, a small monument marks the site of William Penn's first landing in Pennsylvania.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

At 207 feet, one of the world's longest continuous escalators.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Rising out of a clearing in New Jersey's Pine Barrens is an Aztec-inspired monument to the "Lindbergh of Mexico."

This 25-foot-tall gorilla made his way from the Wildwood boardwalk to a Pine Barrens gas station and deli.

Thousands of Matchbox cars spanning generations call this New Jersey barn home.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Apartment complexes built into huge repurposed natural gas tanks.

Inside this 150-year-old barn turned antique shop is a vast array of items for curios hunters.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

This tiny structure was built by the creator of the Brooklyn Bridge.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

A beautiful oasis town dating back to the Roman period still serves as reprieve from the brutal summer sun in Libya.

Time travel with sweets across history at this research-based candy store.

A nearly 100-year-old dining car in upstate New York embodies the golden age of roadside dining.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The sole remaining outpost of a once-thriving South Carolina chain still sells “pic-a-nic” baskets.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.