Volcanic rocks ground down into sand make this Spanish beach as black as night.

Abandoned tunnels dug for the once-thriving sea salt industry on the coast of southern Spain.

An enchanting landscape of ancient sandstone structures eroded into otherworldly shapes.

Rumors and legends of secret Nazi activities surround this eerily remote island mansion.

An impressive home made of stone, carved more than a century ago.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This enchanting hamlet carved into the rock looks like something straight out of Tolkien's Rivendell.

During an annual Catholic feast in this tiny Spanish village, men dressed as devils leap over rows of babies to cleanse them of sin.

A celebration of solstice followed by a fiery purging of evils.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

A network of hundreds of interconnected wineries in caves hides under the town center.

Giant topiary dog once played a role in a terrorist bomb plot.

A medieval village holds a very modern hotel.

A charming Spanish village sits atop this natural limestone overpass.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

A fascinating little museum dedicated to the thousands of chemical substances concealed in our food.

The largest collection of handbags in the world, the oldest of which were used to carry Bibles, primarily by men.

Elevated freight railway turned wildly successful urban park.

The largest earthwork effigy in the world.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

These mansions date back to Chicago's days as a brewer's paradise.