Mysterious rocks that ring musically when struck.

In which a local geological marvel becomes a quaint roadside attraction.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

This dramatic rail curve was once the target of a failed Nazi attack.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

Locals call this magical moss-covered walkway the "Emerald Path."

A natural gas leak provides a flickering flame beneath a waterfall.

For decades, it has disappeared and reappeared as water levels rise and fall.

A hidey-hole sandwiched between cellphone, DVD, and jewelry stores features Tibetan delights.

This Catskills museum preserves stumps from the earliest known fossil forest on Earth.

Home to the deepest rift anywhere on Earth.

This landmark is a central figure in the Nez Perce origin story.

Scotland still bears an enormous scar of its Roman past.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

An enchanting rocky island of scraggly baobabs surrounded by an ancient sea and sprawling salt pans.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

Rare recess caves fill this unbelievably beautiful Ohio park.

A lavender labyrinth so large it’s visible on Google Earth.

Every week, a festive public jam session breaks out in downtown Asheville.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

A swath of France so devastated by war it is still forbidden to go there.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.