An avant garde art museum at the University of Chicago.

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

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

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

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

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 century-old tradition has culminated in a small but singular collection of feline effigies.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

Ship-sized kinetic sculptural fantasy.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Catacombs turned marketplace.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Rebuilt remains of a temple to Roman god Mithras.

Hear the quietest sound from across the dome.

An unusual round church in London with a Templar past.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The once highest point in China blends symbolic design with a kick of adrenaline.

Enormous burial mounds of ancient emperors.

The footprint of a frustrated devil in Munich's Cathedral.