The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

Outside Hope College in Holland, Michigan, a marker honors a University without people from the fictional Kcymaerxthaereal times.

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

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

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

This striking art museum holds an amazing series of curiosity cabinets.

A place to eat for on-the-run agents and espionage enthusiasts.

Statue dedicated to the star of an old television show.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

A largely forgotten and touching neoclassical marble fountain overlooking a bear mound effigy.

A bizarre house filled with an astounding array of collections.

The Kalamazoo factory has 100 years of instrument-making, and one big wartime secret.

The former home is said to be haunted by the ghosts of the beloved mayor and his wife who lived here.

In Grand Rapids, Michigan, a marker honors the creation story of a proud fictional culture.

At HopCat, a marker honors fictional creatures with the ability to travel the missing dimensions of Kcymaerxthaere.

The unusual medical inventions of the man who gave the world Corn Flakes.

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

Glass and concrete building designed by Albert Kahn.

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

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

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