Amazon has tapped into the power of J.R.R. Tolkien, spending around $715 million US on its new series, The Rings of Power, reportedly the most expensive TV show ever made. What is it about Tolkien's fantasy realm of Middle-earth that has held our attention for so long, since his early writings in the 1930s? Today on Front Burner, we're talking to historian Dominic Sandbrook — co-host of The Rest is History podcast — about how Tolkien's world strikingly mirrors our own, from war, to modernity, to greed, to the fight to save the environment.