500
Other than the presence of nautical charts showing islands on the Western side of the Atlantic Ocean, Gavin Menzies argued this was a piece of evidence from the Western Hemisphere demonstrating 15th Century Chinese presence in the Americas.
What are genetic similarities between Native Americans and Asians, Bimini Road as a constructed "slipway," Newport Tower as a Chinese observatory, early European accounts of finding people with "Chinese" qualities in the Americas etc.