What do we know about the real woman behind one of the Beatles' most famous songs?

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

The remnants of a classic 1970's British film.

The oldest remaining authentic Putt-Putt course that Donald Clayton created in Ohio.

A failed infrastructure project now owns this unique moniker.

Anna Anderson spent most of her life claiming to be the lost Romanov child Anastasia.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Where a brain, a beauty, a jock, a rebel, and a recluse met one Saturday and changed their lives forever.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

At nearly 1,000 feet long, this astonishing glass suspension bridge is one of the longest in the world.

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

The latest in a series of long glass bridges suspended at terrifying heights.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

This Nigerian nature reserve is home to the longest canopy walkway in Africa.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This colorful overpass is one of Bhutan's longest suspension bridges.

The fading, forgotten remains of a once bright and booming factory.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

The oldest continuously-operating Chinese restaurant in the United States has been in business since 1911.