This extraordinary geological oddity resembles human-made pavement.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

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

The only pollutant in the clear blue water is sunscreen.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

The unique ecosystem atop an Australian mountain is home to some colorful inhabitants.

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

A small, but award-winning beach known for its literally spotless reputation.

A collection of outdoor mystical statues paying homage to indigenous Australians and ecological stewardship.

Nature is leading a successful mutiny on this century-old freighter.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

One man's extraordinary topiary garden in a small South Carolina town.

This structure among the trees was the result of divine inspiration.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

An eight-sided home built during a brief octagon craze in the 1850s.

The highest point in Virginia can only be reached by passing through ponies and flowers.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

All that's left of the quintessential "cabin in the woods."

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

This vast kitty-themed collection illustrates the history of human-cat interaction.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

The oldest bridge in South Carolina may have been designed by the same man who created the Washington Monument.