Rome's semi-secret peephole vista is also a former Crusader stronghold.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This demon atop the Notre-Dame de Paris looks utterly bored.

The celebrated eyesore created by starry-eyed sweethearts.

The video game-themed street art first popped up in the French city.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Paris' linguistic guide to the international language of, yes, love.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The birthplace of professional hockey on the shores of Portage Lake.

One of the few working locomotive roundhouses in the United States.

This missionary's legacy looms large over the Upper Peninsula of Michigan—literally.

A comedy troupe's collection of bizarre humor.

There's more contention than one might expect from cherry pie pans.

As its grandiose name implies, this wooden dome is unsurpassed in size.

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

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

A mysterious light in the wood, rumoured to be the the ghost of a railroad brakeman.

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

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Strange physical sensations and optical contradictions keep visitors coming back for more.