This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

To find the "unicorns of the deep" you've got to go downstairs.

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

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

The final resting place of the great navigator, or maybe his brother.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Two stunning 17th-century libraries and a cabinet of curiosities.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Macabre astrological automaton clock dating to the late 1400s.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Ancient burial grounds of the wealthy.

The official meeting point for the oddly named governing assembly of ancient Sweden.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's deepest subway station is also a stunning ecological wonder.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

Wisconsin's most celebrated export gets the royal treatment on I-94.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

A unique botanical garden housed in three giant geodesic domes.