This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The palatial McDonald's that inspired Wesley Willis.

A monument to the art of slicing people open.

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A crumbling hospital from the 1850s on Roosevelt Island.

One of only two commuter aerial tramways in the United States.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The only surviving prototype for Buckminster Fuller's house of the future.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Three hundred years of preserved Spanish colonial history in San Antonio.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

When ecosystems collide in the arid Southwest.

A beautiful 62-acre Catholic shrine and botanical garden.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

An extraordinary mixture of natural beauty and man-made phenomena.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A vertically floating hemlock controls the waves and weather at Crater Lake.

A tourist attraction founded around a slumping cabin.

The first North American landing spot for James Cook on his third voyage of discovery in the Pacific.

A massive sea stack famous for its appearance in The Goonies.