Two flush headstones mark the only known graves to be embedded in an airport runway.

This divisive system of turtle tunnels was built to save animals stranded after a highway split a lake in half.

A giant 400-acre preserve in North Florida for displaced wolves.

This set of rickety spaceships are prepared to give alien travelers a place to relax and go to the bathroom.

A historic covered bridge, only one of two remaining in North Carolina.

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

A beautifully detailed Victorian house designed to be easy to flee, built by a man haunted by fire.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

A humid oasis combines recreation with exploration in a unique underwater cavern.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

This natural spring not only claims to heal the wounded but it has also been willed to God.

A local scoured more than 1,000 acres for stone to create his masterpiece.

The world's longest known cave system.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

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

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

Home of an evil witch famous within southern folklore.

Railroad came. People came. Railroad left. Town died.

This boulder stays on its mountain thanks to a huge chain and on the map due to local legend.

Moonbows over Kentucky.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

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

Death comes to anyone who dares to touch this concrete column.

An art instillation for the sake of "raising vibrations."