The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

Get up close and personal with these majestic fish.

This former luxury resort in Kaua'i is now an abandoned relic.

This legendary urban waterfall creates a dazzling display of rainbows.

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

These ancient sacred grounds granted amnesty to those who managed to reach them.

A tunnel of hardened lava along Maui’s famous Road to Hana.

Race through the maze, get your name on the sign.

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.

This black shoreline is made up of exploded lava particles.

The bespectacled, cocktail-sipping pachyderm is a strange but fitting liquor store mascot.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

The highest point in Virginia can only be reached by passing through ponies and flowers.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.