Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

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

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

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

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

Trade in that pesky human soul for cold-hard circuits.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

The city is full of whimsical portals to another world.

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

The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Traditional 11th-century outdoor tannery.

Mosaics, storks, and brothels—this ancient city has it all.

Founded as a refugee camp, now a popular tourist spot.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Ancient burial grounds of the wealthy.

This stunning concert hall has become a symbol of Iceland's national recovery.

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

The modern birthplace of Irish freedom.

A hugely vast Irish landscape of barren rock that stretches for miles.

This single room has survived the centuries with almost no deterioration.

Behemoth, cannon-like telescope operated by generations of Irish earls.