The Amber Room was reassembled by the Germans in the Königsberg Castle during WWII. Publications International, Ltd.

They were fantastic examples of opulence, decadence, and splendor. People marveled at their beauty, drooled over their excess, and cowered at their power. And now they're gone.

But where are they? And what happened to them? Explore our list of six of the world's greatest missing treasures. We'll start with one that would be worth an estimated $142 million today.