This black shoreline is made up of exploded lava particles.

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.

From scholastic to sepulchral - now under reconstruction.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

Exact replica of the ancient monument, but much, much lighter.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

This elegant arc of a waterfall marks a religious turning point.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

This cave holds a surprisingly colorful variety of geological oddities.

A winding, blood-red tunnel of hardened lava navigable by foot.

A derelict bit of transportation infrastructure hidden in the woods.

This expansive bridge in the Canadian wilderness was originally just built for friends.

An ordinary pond with fish from out of this world.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

100-year-old shipwreck you can walk up to at low tide.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

Over 50 whirling pools left behind from the glacial age.

Stunning wetlands ablaze with pink lotus flowers.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

A historic covered bridge, only one of two remaining in North Carolina.