On May 29, 1453, Ottoman Sultan Mehmet II captured Constantinople, bringing an end to over a thousand years of Byzantine rule. The city's formidable walls, which had stood nearly impenetrable for eight centuries, finally fell to hisforces. With its conquest, Constantinople was declared the new capital of the Ottoman Empire. Some historians marked this conquest as the end of the Middle Ages.

Built by Theodosius II to safeguard the "New Rome," these walls stretched from the Golden Horn to the Sea of Marmara, marking the borders of ancient Istanbul. Through centuries of earthquakes, sieges, and urban expansion, their gates and fortifications have endured, preserving the legacy of the city's past.

To discuss the world-history importance of this conquest is today’s guest, Alexander Christie-Miller, author of “To The City: Life and Death Along the Ancient Walls of Istanbul.”

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In the summer of 1849, Edgar Allan Poe knocked on the door of his friend John Sartain's Philadelphia workshop, wild-eyed and without luggage. He had fled a train in New Jersey after overhearing passengers plotting to kill him. His senses had grown so acute, he said, that he could hear whispers from miles away. He asked for a razor to shave off his mustache so his assassins would not recognize him. Sartain, who was not about to hand his friend a blade, cut it off with scissors instead. That night, Sartain followed Poe on a midnight walk to a rickety platform high above the Schuylkill River and stood between him and the drop, hoping the man beside him could pull himself back from the edge. A few weeks later, Poe was found delirious outside a Baltimore polling place wearing clothes that were not his own. He died four days after that. He was forty years old.

Today's guest is Emily Ogden, author of Darkness Becomes Bright: On the Brief Life and Immortal Art of Edgar Allan Poe. We discuss how Poe was orphaned at two, raised by a foster father who disinherited him, and married his thirteen-year-old first cousin, whose five-year death from tuberculosis drove the most productive and most desperate period of his career. We look at why Poe’s compulsive self-sabotage, from quitting steady jobs to destroying his chances for a government sinecure by getting drunk and insulting everyone at the party. We see that Poe's genius was to turn toward darkness rather than away from it, and that in doing so he created a space where the rest of us can tolerate ourselves as we actually are: limited, cruel, perverse, and mortal, but still glittering with a heavenly light.

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The 17th-century battlefield ushered in a new era, with formed musketeers and pistol-wielding cavalry gradually taking over from the knights and men-at-arms that had dominated the European battlefield. But knights could still be found on these battlefields as late as the 1640s, proudly donning their full-plated armor as their lightly clad compatriots looked on in a mix of envy and confusion. What were they doing fighting 17th-century battles?

Today’s guest is Myke Cole, author of “Steel Lobsters: Crown , Commonwealth, and the Last Knights in England.” We examine the life and times of Sir Arthur Hesilrige and his Regiment of Horse, known as "the Lobsters" as they were encased in plate armor. We cover the full history of England's last knights, from the seeds of their creation in Hesilrige’s experience as a young cavalry officer, to their final defeat at Roundway Down in July 1643, and the decision to abandon their armor.

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In 1861, an archaeologist named James Farrer broke into a grass-covered Neolithic tomb on the Orkney Islands expecting to find ancient bones and treasure. The tomb was empty. But its walls were covered with runic inscriptions, dozens of them, carved by Norse visitors centuries earlier. Most were mundane: "Arnfinnr Food carved these runes." Some were lewd: Two were extraordinary: "Crusaders broke into this barrow." "Jerusalem-men broke this mound." The worlds of the Viking north and the Crusades are artificially separated in the popular imagination, but Scandinavians were among the most enthusiastic, brutal, and consequential crusaders in history – working as the shock troops of the first four crusades, and single-handedly converting pagan Baltic Europe to Christianity in a couple of centuries.

Today's guest is Thomas Williams, former curator at the British Museum and author of God's Hammer: A History of the Viking Crusades. We discuss how Scandinavians went from being Christianity's most terrifying enemies to some of its most enthusiastic holy warriors within two centuries, why Harald Hardrada served as a Byzantine mercenary across the Mediterranean and may have policed the pilgrimage routes to Jerusalem sixty years before the First Crusade, and how Vladimir of Kyiv chose Byzantine Christianity over Islam partly because "drinking is the joy of the Russes." We look at how the Norwegian King Sigurd fought his way through the entire Mediterranean six years after the First Crusade to help capture the port of Sidon and received a splinter of the True Cross, and why the Danish conquest of a pagan temple fortress on the Baltic island of Rügen established the template for centuries of northern holy war. Williams argues that crusading gave the violence that had always defined Norse culture a new legitimacy and a new set of enemies, and that they had found a way to be Vikings and Christians at the same time.

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When the First Crusade arrived at the walls of Antioch in 1097, the two most powerful Muslim rulers in Syria were not preparing a joint defense. They were trying to destroy each other. Ridwan of Aleppo and his brother Duqaq of Damascus had been locked in a fratricidal war over their dead father's territories, and neither would yield an inch to help the other. When Karbugha of Mosul finally assembled a massive coalition army to crush the crusaders, it collapsed in a single afternoon despite overwhelming numerical superiority, because the Arab contingents distrusted the Turkish ones, Ridwan was stirring up trouble from the sidelines, and no one trusted anyone else enough to commit fully to the fight. The First Crusade succeeded not because of any tactically brilliant move of Godfrey of Bouillon (although the Siege of Jerusalem was impressive) but because the Islamic world was tearing itself apart.

Today's guest is Nicholas Morton, author of The Crusader Storm: A Global History of the Wars for the Middle East. We discuss how the Seljuk Turkish invasions reshaped the Middle East far more profoundly than the crusaders ever did, why the Fatimid Empire initially treated the crusaders as useful allies against the Seljuks and then made a catastrophic diplomatic blunder at Jerusalem that turned a potential partnership into an existential war, and how the Italian merchant cities of Genoa, Pisa, and Venice were the true kingmakers of the Crusader States because the Franks had almost no ships. We look at how Saladin spent far more of his career fighting fellow Muslims than fighting Christians and needed the Battle of Hattin to justify his entire political project to his own coalition, and why the war for control of Egypt between 1163 and 1169 was the strategic hinge that made the fall of Jerusalem virtually inevitable. Morton argues that the crusades were not a clash of civilizations but one disruption among many in a region already convulsed by Seljuk expansion, Fatimid collapse, and Byzantine intervention, and that placing the holy wars within this wider framework makes the religious fervor that drove them more remarkable, not less.

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On the morning of January 24, 1848, a carpenter named James Marshall climbed into a ditch beside a half-finished sawmill in the Sierra Nevada foothills, stooped down, and found gold. He crawled out clutching his hat to his chest like a hurt child, showed the men a teaspoon of yellow flakes, and said "I have found it." Within a year, fifty thousand people from all six continents were racing to California. Within a decade, 848 tons of gold had been ripped from the earth, nearly five times the amount Spain had extracted from the Americas in 150 years. Within two decades, the nation had been torn apart by civil war and four Sacramento shopkeepers with no engineering experience had built a railroad across the continent using twenty thousand Chinese laborers.

Today's guest is Nathaniel Philbrick, author of The Rush: California Gold, the Civil War, and the Making of the Modern World. We discuss how California went from a sparsely populated Mexican territory to the most diverse place on earth within months, and how its explosive admission as a free state in 1850 shattered the balance between slave and free states and set the nation on a path to civil war that two California senators, one from Mississippi and one from New York, fought out in miniature before one of them was killed in a duel. We look at how the Rush created the template Americans have been following ever since: the conviction that wealth is there for the taking if you move fast enough, that the rules can be written after the money is made, and that whoever gets there first wins, a logic that ran straight from the hydraulic mines that blasted apart mountainsides through the four Sacramento shopkeepers who built the transcontinental railroad to Leland Stanford's horse farm at Palo Alto, where the same culture of speculative risk and ruthless speed became Silicon Valley.

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Early America’s most important invention wasn’t Benjamin Franklin’s lightning rod, or the cotton gin. It was the world's first fully automated flour mill, built by Oliver Evans in the 1780s. Evans's mill used a conveyor-belt grain elevator, leather straps, wheels, and Archimedean screws to process wheat from raw grain to finished flour without human hands touching it. Prior to Oliver Evans's automated system, milling relied on waterwheels or wind to turn heavy millstones, but every intermediate step required grueling manual labor to haul heavy grain sacks up ladders and shovel meal across floors. This invention ranks right below potatoes’ arrival in Europe or Haber-Bosch synthesis of nitrogen for fertilizer or Norman Borlaug’s dwarf wheat in making food cheaper. It also made America unique among nations in the world in that it never experienced a bread riot or mass executions of peasants stealing during a time of famine. It also shows how much we overlook the importance of bread in American history.

Today's guest is Andrew Coe, author of American Bread: A History. We discuss how the Pilgrims nearly starved because they couldn't grow wheat in New England and were saved by a dense loaf of rye and cornmeal that became America's first national food, and how Sylvester Graham convinced thousands of Americans in the 1830s that white bread and sexual desire were destroying the nation. We look at industrialization of food that would culminate in Wonder Bread, and how Vietnam War protesters boycotted Wonder Bread while Zen Buddhists at a California monastery wrote the book that launched the modern whole-grain movement. Coe argues that the story of American bread is the story of America itself: a nation that learned to survive on unfamiliar grain, built an industrial system that stripped bread of everything worth eating, and is now slowly trying to rediscover what it lost.

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The Pyrenees stretch 270 miles from the Atlantic to the Mediterranean, separating France from Spain, and most people think of them as a natural barrier: remote, barren, and largely untouched. They would be wrong. These mountains sit at the edge of where early humans were supposed to have settled, yet a cave above the village of Tautavel contains the oldest human face ever found in Europe, a skull 450,000 years old, with sixteen feet of unexcavated sediment below it that may hold remains older still. And from that moment forward, humans never stopped reshaping these mountains. They cleared forests so aggressively that Louis XIV sent an inspector to survey the damage in 1672 and he found entire valleys stripped bare. They carved terrifying paths into vertical cliffs so oxen could drag tree trunks down for the navy's masts. They built 5,000-year-old agricultural terraces, Roman marble quarries, medieval fortified caves, zinc mines at nearly 10,000 feet altitude so deadly they were called the Man-Eater, and dueling World War II fortification lines on opposite sides of the same ridge. By one measure, the Pyrenees may be the most thoroughly human-altered mountain range on earth, and almost nothing about them, from the treeline to the meadows to the shape of the valleys, is actually natural.

Today's guest is Colin Duncan Taylor, author of The Pyrenees: A Human History. We discuss how prehistoric artists worked 3,000 feet inside a mountain to paint bison and horses that a nineteenth-century archaeologist dismissed as "funny sketches by amateurs," why a 5,000-year-old massacre in a Spanish cave reveals the violent birth of farming in Europe, and how transhumance, the seasonal movement of livestock between lowland and mountain pastures, created a cross-border legal system that predates any nation-state by centuries. We look at how the French navy hacked a terrifying path into a cliff face so oxen could drag tree trunks down for ship masts, why a village of fifty-five people built a museum for a 5,500-year-old goddess statue that someone had chopped up to build a tomb, and how both Franco and Hitler simultaneously fortified opposite sides of the same mountain range to fight each other. Taylor argues that the Pyrenees are not a barrier between France and Spain but a bridge that humans have been crossing, shaping, and fighting over for thousands of years, and that almost nothing about these mountains is truly natural.

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