The “American Gothic" artist's largest works hang in an Iowa State University library.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Outsider art meets paleontology at this roadside reptile repository.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A diorama of the Civil War, fought by cats.

The writing studio of an American adventure author, built in the style of a medieval castle.

The remains of a failed subway in upstate New York is now an underground graffiti bunker.

"Call for the doctor, call for the nurse... Vote!! said the lady with the alligator purse."

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

The city is full of whimsical portals to another world.

An ever-evolving wall of graffiti art off East Liberty Street.

This Toronto garden collects stares and tchotchkes in equal measure.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

The absurd creation is a compulsory destination for selfies in Buffalo.

This modest post office sits on the site of H.H. Holmes' famous murder castle.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

A hollow cement depiction of time's inexorable effect on the human body.

Moving, mind-blowing metal sculpture work of an outsider artist.

Take a drunken tour inside the world's largest known geode.

The first artificial white water river course in North America cuts right through an Indiana city.