This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

A tiny, remote island packed with wonders both natural and geeky.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Fossilized sea bottom and lime quarry.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

What happened to the three lighthouse keepers who vanished from this place remains a mystery over a century later.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

Friction between grains of sand cause a curious "singing" sound.

An eccentric inventor's castle home with its own indoor weather system.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

A petite white lighthouse perched on the ancient core of Stromboli Volcano.