This unconventional used book store was once in the news for the surprising act of burning books.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Europe's official "zero-level," the equator of elevation.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This cheese shop also houses a museum devoted to Dutch dairy.

This abandoned prison castle has become an imposing gallery of graffiti art.

Community bookshelf of 25-foot-tall book spines.

A piece of John the Baptist in the American heartland.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

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

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.