Five varieties of trees with custom-designed grates around the trunk are planted along the route of the Seattle Transit Tunnel.

This Cold War siren is one off the last of its kind still standing with its immensely powerful original horn.

Providing the soundtrack to the golden years of the Seattle grunge scene.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

A museum dedicated to the history and exploration of both popular music and science fiction.

One of the last Depression-era bandshells still standing was the site of Elvis Presley’s first live concert.

A natural sandstone bridge hidden in the Sewanee forest.

For decades these polar bears have roamed all around a Nashville neighborhood.

This simple, broken column marks the final resting place of one of America's most famous explorers.

Ethereal alien hums and haunting whale songs emitting from...a giant sheet of vibrating metal?

The "Jade Museum" is full of thousands of intricately carved works of art made from various precious stones.

An engraved boulder marks the spot where Patsy Cline's life ended in a plane crash.

Mile-long cave system near Great Smoky Mountains.

The sprawling attraction boasts a collection of more than 150 historic wagons.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

The final resting place of infamous outlaw Clyde and Marvin Barrow.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

A typical "Old South" manor, once owned by author Anne Rice, served as the setting for several of her witchcraft sagas.

This 45-story tall abandoned skyscraper is the third tallest building in New Orleans and Lousiana.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

This strange, small castle on the bayou has withstood the test of time and weather.

One of the oldest continuously-operated gay bars in the United States is allegedly haunted by Truman Capote and Tennessee Williams.

This macabre shop, filled with art, oddities, and taxidermy is hidden in the heart of the French Quarter.