From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

Mysterious rocks that ring musically when struck.

The world’s first penitentiary, meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Old Danish castle immortalized in Shakespeare's Hamlet.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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

This lake-bound geographical marker sits at the point where three European countries intersect.

A toxic ghost town sitting atop a massive coal fire.

Home to three historic ships from the age of Vikings.

Copenhagen's celebrated theme park and gardens.