Like Mars, but much closer.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.

The highest point in Oklahoma used to be a lawless outlaw's paradise.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

Stroll through a wonderland of stupendous moss-covered trees.

The bullet-banged DIY suit of armour belonging to Australia’s most famous outlaw.

Come for the flowers, stay for the bats!

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

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

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

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

Oldest unrestored plantation house in America that is open to the public.

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

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

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Tiny castle in the middle of the Rhine made you pay to pass.

Legendary site where an evil bishop was devoured by rodents.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

There has been an astronomical clock on this spot since the 14th century.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.