Site of the first pathological and bacteriological research facility in the United States.

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

A crumbling hospital from the 1850s on Roosevelt Island.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

Moonbows over Kentucky.

This replica of the Greek structure is in the heart of Nashville.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

Former self-sufficient mental institution now a planned community.

These pretty kitties killed and ate as many as 135 railway workers.

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

A bizarre roadside attraction and the first instance of miniature golf in the world.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

Enormous lake at the bottom of a unique cave system.

The secret city built by the Manhattan Project.

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

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