Tomb of first China emperor:
United the warring states, completed the Great Wall, terracotta army of thousands, standardized language/money/measurement, mass produced assembly line production, crossbows a thousand years before europe,
chrome plated weapons in freakin' 220 b.c.
The still unopened tomb is alleged to have a giant map room with forests of jade, animals of silver, stars of diamonds, and moving rivers of mercury.