On the Oregon coast there is a natural hole that seems to be draining the sea.

Most-visited and most-photographed slot canyon in the American Southwest.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

World's largest collection of serial killer artwork and other macabre exhibits.

Rippling sand dunes frozen in the Arizona rock.

An artsy hidden staircase leads to breathtaking views of San Francisco.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A lush green oasis in the middle of Chicago.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

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

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

This historic Australian bridge was built by convicts with giant stone spikes to prevent cattle from falling off the sides.

The longest fence in the world stretches over 3,000 miles to keep the dingoes out.

After much poking and prodding, this island is decidedly not a magnetic anomaly, but it sure is pretty.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

This massive water spout has been luring visitors for hundreds of years, some to their death.

Clusters of huge boulders in the Australian Outback.

Aqua white sand highlighted with fiery red rocks.

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

A collaboration of art and ornithology mourns the calls of Sydney's lost birds.

Thousands of lawn gnomes have infested this Australian roundabout.

Alien rock formations grown from the sands of an Australian national park.

A stray meteor left this picturesque hole in the Australian outback.