The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

America's oldest archaeological site or a muddled case of wishful thinking.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

This castle resides in a valley known for immense bloodshed during the Middle Ages.

This lesser-known leaning tower is all that remains of the medieval castle of Vernazzano.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

A grove of "candelabra redwoods" deep in California's Lost Coast.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

Rare recess caves fill this unbelievably beautiful Ohio park.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A perilous medieval road leading right into the sea.

Described by William Wordsworth as a "World of Wonder."

A rare example of an ancient Japanese hill castle believed to be the fortress of a legendary demon.

This iconic sluice gate is a favorite haunt for joggers, fishing enthusiasts, and even ghost hunters.

A flight of this "ghost staircase" has 40 steps on the way up, but only 39 steps on the way down.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

This scenic fortress dates back at least 2,400 years to the time of Magna Graecia.