TIL that there are Ancient Stone Walls around the Bay Area in California that stretch over 50 miles. Early Spanish settlers and Native Americans both said the walls were there before they arrived. Despite wild speculation, no serious scholarly study has ever been conducted on the walls.

TIL that there are Ancient Stone Walls around the Bay Area in California that stretch over 50 miles. Early Spanish settlers and Native Americans both said the walls were there before they arrived. Despite wild speculation, no serious scholarly study has ever been conducted on the walls.