The cliff and rock formations are made out of Sioux Quartzite.

The grounds and buildings of an old wood pulp mill have been transformed into an innovative art park and museum.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

A Prada store in the West Texas desert that is never open for business.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

One of the world’s longest pedestrian suspension bridges.

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

A brutalist gem towering over the heart of Milan.

An architect transformed this abandoned cement factory into his castle-like workshop.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The stunningly blue waters of these beautiful caves also have a violent past.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

This hulking behemoth is actually five interconnected towers built in the 1960s.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

Denmark’s never-ending bridge.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A magically clear, blue river that seems to spring from nowhere.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

The eerie remnants of an ancient forest were hidden under the sand for centuries.