An enormous natural sandstone bridge in Kentucky.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

One of the few surviving "Wigwam"-themed motels.

Moonbows over Kentucky.

The world's longest known cave system.

Of course the guy with the first patent for an ice machine lived in Florida.

The museum chronicling a treasure hunter's dream, fulfilled.

The highest point in Florida is still the lowest high point in the country.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

A suspended garden, now gone, once hung in the middle of this abandoned church.

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

This collection of Japanese luck idols beckons visitors with over 2,000 waving paws.

An abandoned relic of the city's failed experiment with below ground transit.

Where beautiful signs live on forever.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The ruins of a Florida miracle spring resort make it seem like a wonder that this was ever a health spa.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

An unfinished rail tunnel that has since been used to house cheese and bats.

A museum that houses the world's largest collection of ventriloquism dummies.

The largest earthwork effigy in the world.

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

This alley-cum-fan gallery in the ex-Nirvana drummer's hometown holds the world's largest drumsticks.

The site of Neil Armstrong's first flight is marked by a full on replica of the moon landers.