Advice-columnist's bell tower, paid for with pennies.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

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

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

There has been an astronomical clock on this spot since the 14th century.

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

A futuristic rocket marks the spot where three borders meet.

This 42-foot tribute to the workforce still reminds us to pause and recharge.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

Climb inside an iron crystal magnified 165 billion times its normal size.

This cannonball has been lodged in the church wall since a 1695 bombardment destroyed the city center.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

A little sculpture with a large wardrobe.