Rippling sand dunes frozen in the Arizona rock.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

This hidden gem in Arizona is truly worth the rugged journey.

Ancient man-made caves underneath small town Belgium.

Personal garden filled with mosaics made of recycled garbage.

Mysterious face-like images that appeared within an Andalusian house are surrounded by legends of the paranormal.

Whimsical sculptures and caves chiseled by nature over the millennia.

This mesmerizing and surreal landscape features intricate patterns of white and red sandstone.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

The remains of diamond fever taken over by the desert.

This once-booming Gold Rush town is now home to a herd of feral donkeys.

Once one of the largest sites of silver deposits in Italy.

Archaeologists believe this panel of petroglyphs depicting descending sheep and other figures in Glen Canyon are 3,000 to 6,000 years old.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

This historic little railroad runs through some of the most beautiful scenery in Germany.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A massive playground in the woods of Germany.

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

One of the most important Celtic-Roman archaeological sites in Spain.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

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

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.