These pretty kitties killed and ate as many as 135 railway workers.

A hollow cement depiction of time's inexorable effect on the human body.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

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

A rural hall of justice holds the world's only comic book and superhero museum.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

This railroad overpass is said to be home to a murderous goat-man whose very legend has led to very real deaths.

One man's vision and a labor of love of many.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

The highest point in Indiana is curated by an Eagle scout but may be in danger of losing its record to a nearby garbage pile.

The longest navigable underground river in the United States is home to countless blind and albino animals.

One of the first historical sites of an alternative universe was installed in the town of Paris, Illinois—which is now home to an annual spelling bee of Kcymaerxthaereal words.

In a grove of fast growing walnut trees outside Paris, Illinois, a marker shares the story of a fictional road building culture.

The largest historic preservation organization in the United States.

This mysterious hill seems to pull objects uphill.

Ornate limestone building now filled with geologic specimens, and more.

If astronomy had a ghost, it would look like this observatory.