Courtesy Andrew Carroll
Historian Andrew Carroll traveled to all 50 states and collected enough research to fill two-dozen file cabinets for his new book.
Some of the first experiments to invent TV happened in an apartment in Hollywood, but neither the people living there, nor the neighbors had any idea until historian Andrew Carroll knocked on their door.
He's New York Times bestselling author who found the apartment – and other little-known places in L.A. – while working on his new book "Here Is Where: Discovering America's Great Forgotten History."
KPCC's Ben Bergman was with Carroll as he looked for lost sites.