After covering almost 1.5 billion acres, the survey's still not finished.

A throwback train ride transports passengers through one of the lesser-known national parks in the country.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

A humble plaque marks the site where the country music legend was found dead in his Cadillac.

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

This tiny historic jail along Route 66 is the perfect fit for exactly one criminal and their partner-in-crime.

Hidden on two floors of downtown building, the library has an incredible deal on rent.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

A history of tragedy and a pile of eerie stories have contributed to this house's consistent ranking as one of the most haunted places in Ohio.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

One of the few working locomotive roundhouses in the United States.

Deep scars on the earth left by the Ice Age.

This life-sized effigy commemorates the dedicated abolitionist and social reformer.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

Indiana's oldest sternwheel paddleboat has been plying the placid waters of Webster Lake for 90 years.

A table rock formation that has been intriguing West Virginians for years.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

One of the last few period-correct, hand-operated canal locks in the country.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

This moving cemetery sphere is a slowly rolling stone.