This massive airship factory is so large that it has its own indoor weather.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

This moving cemetery sphere is a slowly rolling stone.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

A gas station has taken the place of the home of the 19th American President.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

In this relatively flat state the highest point is an honored place.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

Abandoned former poorhouse, bible college, and haunted house in an Ohio hamlet.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

An office built to look like a giant basket.

A steel paper plane is all that remains of a crashed aircraft that caused an amazingly small amount of damage.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.