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

This experiment in the lifespan of seeds will take a century before it is complete.

The plants form a living library and laboratory for researchers and students at Michigan State University.

Housed in the university planetarium, the thousand-strong collection of tiny towelettes includes a used one from the hosts of Car Talk.

A park and memorial dedicated to the victims of the deadliest school massacre in American history.

The last remaining tollhouse in Michigan built during the 19th-century plank road craze.

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

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

The park is home to the United States's only still-operating Dutch windmill.

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

On the shores of Lake Kalamazoo, a plaque marks a fictional event where an island nation ran aground.

The remains of a religious colony, its amusement park, zoo, and baseball empire.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

A set of tall pillars and alcove-like rooms that are significant to the Miami people of Indiana.

The humble Hoosier roots of a famed Broadway composer.

This relic of transportation history still stands in this Indiana city.

Along this stretch of Indiana roadway resides a giant insect composed entirely of scrap metal.

Low-frequency noise compared to an idling train can only be heard by some of this industrial town's residents.

An opulent testament to the boom-and-bust history of industry in north central Indiana.

A bloodstain from "the wound of the transverberation of the heart."

A group of artists transformed this desolate city alleyway into an outdoor gallery of street art.

An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

The titular fictional logger only inhabits this otherwise historically focussed museum via a piece of fiberglass kitsch.