This historic Ohio bridge is adorned with fanciful locks left behind by loving couples.

In northern Ohio, the glorious past of America's trains is on full display.

For decades, this waterfall remained hidden because of an artificial dam.

A Hawaiian stairway to heaven—that you can't climb.

A Japanese pilot crash-landed on this Hawaiian island after the Pearl Harbor attack and terrorized locals for a week.

Football field-sized microalgae production tanks on the Hawaiian coast create a stunning view from space.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

Watch the newest land on the planet form before your eyes.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

The ruins of the suspension bridge hang over Kingsbury Run as a ghost of racial prejudice.

Rare recess caves fill this unbelievably beautiful Ohio park.

A castle built by an eccentric medieval enthusiast in rural Ohio.

Known as the "Stairway to Heaven," this historic canal dates back to the 1700s.

This sculpture is an instrument played by the swell of the seas.

This historic abandoned train station looks like a stop for ghost trains.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.