This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

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

The Cadillac Ranch for monster truck aficionados.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

A vast collection of everyday items amassed by one man.

A giant time capsule not scheduled to be cored until 2040.

The ruined remains of a coal mining ghost town are hidden within the woods.