Underground Railroad secrets revealed with drones, lasers and radar

Archaeologists and historians have uncovered new clues about the Underground Railroad and the people who risked their lives to escape enslavers in 19th-century America.

Underground Railroad secrets revealed with drones, lasers and radar
Archaeologists and historians have uncovered new clues about the Underground Railroad and the people who risked their lives to escape enslavers in 19th-century America.