Around 600 ancient mirrors were discovered in a sacred pond in Japan.

Evidence

At the beginning of the twentieth century this pond was drained in order to build a bridge for pilgrims. To the astonishment of the engineers, deep in the mud at the bottom of the pond they found around 600 mirrors (ours among them) which over the centuries had been consigned to the water. — Neil MacGregor, A History of the World in 100 Objects, 924

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 924
• XREF: connects to: Japanese mirrors were once used in sacred rituals and communication with gods. — Neil MacGregor, A History of the World in 100 Objects, 924