When archeologist Hiroyuki Miyagi heard that a bunch of ancient Roman and Ottoman coins had been unearthed from the ruins of an old castle in Okinawa, he initially thought it was a hoax.

A haul of coins from halfway across the world turned up on an archaeological site in Japan. Exactly how they got there is a fascinating mystery. Michelle Starr is CNET's science editor, and she ...

Treasure trove of 100,000 ancient coins, some dating back 2,000 years, discovered at construction site in Japan, officials say.