A botanically themed auditorium blooms within the world’s last operating double-decker theater.

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

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

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

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.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

Home to a protest movement, a bombing, and a dramatic change in labor history.

The final resting place of Harriet Tubman and other famous historical figures.

What remains of the simple red brick chapel where the women's rights movement began.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

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

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

The prototype for all Nazi concentration camps.

Enter the cabin of a life-sized Hindenburg replica.

The fairy tale castle of the "fairy-tale king."

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.