One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Charles Babbage's proto-computer, painstakingly brought to life.

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

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

Hear the quietest sound from across the dome.

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

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

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

A granite monument honors a beloved World War II canine mascot.

The ghostly remains of an accidental sea.