Available on Investigation Discovery, Food Network, Science Channel, Discovery, TLC, Travel Channel, HGTV, Prime Video, discovery+, Hulu, Sling TV, Animal Planet
S1, E2: A team of explorers discover a forbidding cave system riddled with ancient markings that seem to contain a mysterious meaning; using advanced photogrammetry, experts finally decode these cryptic scrawls to expose a dark chapter of English history.
History · Feb 21, 2021 · 42 min