Bali's remote "gateway to heaven" is one of the most sacred places on the island.

This unimaginably large pile of sand near Nazca is one of the tallest dunes in the world.

The highest tropical mountain range in the world is in Central Peru, home to a vast array of exotic and quirky plants and animals.

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

White llama terraces dazzle in Peru's "other Machu Picchu."

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

An unexpected desert oasis in South America.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

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

Rippling sand dunes frozen in the Arizona rock.

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

A man-made slag heap that you can "ski" down, and is home to the world sandboarding championships.

Go surfing on this urban wave, "hacked" by local surfers.

Hamburgers are intensely proud of their tunnel beneath the river.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A collection of abandoned typographic signs from Berlin and beyond.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A miniature desert appears out of nowhere on the lush isle of Lemnos, like something out of a Greek myth.

What once sat in the world’s spotlight is today a largely disused ghost complex.