Perched atop a brick smokestack, this enormous lug nut symbolizes the local minor league baseball team.

The first memorial dedicated solely to the Black troops who fought for the Union.

This mechanical wonder towers above a river in Michigan's capital city.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A much-maligned monument to teetotalism.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

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

38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

This shallow cave got its name from copious amount of human bones found inside.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The only surviving prototype for Buckminster Fuller's house of the future.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Walk in the footsteps of the gods and straddle two tectonic plates.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Perhaps the most scandalous statue of America's first president.

It was once the base for a series of domestic terror attacks.