A clear example of the process of erosion in action.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

One of the oldest operating hydroelectric power schemes in Australia.

An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

A symbol of the early days of skiing in Australia

This Australian ski resort was forced to close due to changing climate conditions.

Ripped apart by a bomb in 1993, the shell of Pablo Escobar's infamous vacation house still stands.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

The gondolas let you glimpse a bird's-eye view of one of the world's highest capital cities.

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

Constructed on the ruins of a convent, this tower saved countless lives.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

A natural rock bridge towers above the sea.

Many rock climbers have come to conquer this slender sea stack, with various degrees of success.

The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

It's said that visitors can "see" Tasmania inside this cave.

Once the path of a railway tunnel, now home to thousands of glowing insects.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

A 19th-century perch for spotting sailing ships now boasts one of the most iconic views in the Southern Hemisphere.

Come for the flowers, stay for the bats!

Native Australian lizards inhabit this garden celebrating Sydney and its sister city in China.

The sand is such a bright white that on sunny days you practically need sunglasses to look at the ground.