This is part of our weekly series, Lost Masterpieces, about the greatest buildings and works of art that were destroyed, lost, or never completed.

It’s like Mayan ruins lost to time or the fabled city of Atlantis. There once existed a golden room bedecked in floor-to-ceiling amber, gold, and semiprecious stones.

It positively glowed. Two different kings called it their own, and it graced multiple palaces, ultimately becoming the prized treasure of the Russians.