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The Great Ziggurat of Ur, called Etemenniguru, the house whose foundation creates terror, was commissioned in the 21st century BC by King Ur-Nammu of the Third Dynasty of Ur as a shrine to the moon god Nanna, near modern Nasiriyah in Dhi Qar province, Iraq. Its footprint measured 64 by 45 meters and it likely stood over 30 meters tall. Builders wrapped a core of sun-dried mud brick in a shell of k...

The Potala Palace rises on Marpo Ri, the Red Hill, about 3,700 meters up in the Lhasa Valley, named for Mount Potalaka, home of Avalokiteshvara, the bodhisattva of compassion. In the seventh century the Tibetan emperor Songtsen Gampo kept a meditation cave there, the Chogyal Drupuk, which was absorbed into the later building. After the Mongol leader Gushri Khan gave the Fifth Dalai Lama secular co...

In the 1970s in Taos, New Mexico, architect Michael Reynolds began building homes out of trash, starting with an experiment called the Thumb House. His rules were simple: use sustainable, indigenous, or recycled materials, run entirely on natural energy, and keep the design simple enough for someone with no construction skills. The result is the Earthship, a horseshoe-shaped home facing 10 to 15 d...

George Washington Vanderbilt II, the bookish outlier of a railroad and shipping dynasty, fell for the Blue Ridge Mountains near Asheville, North Carolina, and through agent Charles McNamee quietly bought about 700 parcels totaling 125,000 acres, absorbing over 50 farms, part of the community of Shiloh, and at least five cemeteries. Architect Richard Morris Hunt designed a French Renaissance chatea...

William Randolph Hearst spent childhood summers in canvas tents at Camp Hill on the California coastal land his mining magnate father George Hearst bought in 1865, then at age 10 toured Europe for 18 months with his mother Phoebe in 1873. When she died in 1919, he inherited 11 million dollars and a quarter of a million acres, and asked San Francisco architect Julia Morgan for a simple bungalow. Mo...

Starting in 1928, Buckminster Fuller set out to mass-produce houses the way Henry Ford built cars, finishing a first design around 1930. An early grain bin inspired version led him to what became known as the urban dust dome effect: vents at the top and bottom of a dome create a heat-driven vortex that pulls cool air down into the living space. The Dymaxion House dropped foundations and load-beari...

Richard Buckminster Fuller Jr., born in Massachusetts in 1895, invented an umbrella-driven rowboat at 12, rejected classroom geometry, and was expelled from Harvard twice, once for spending his tuition on a party with a vaudeville troupe. After work as a mill mechanic, a meatpacker, and a Navy radio operator, he lost his daughter Alexandra to polio and spinal meningitis in 1922 and blamed the fami...

Bran Castle is sold to the world as Dracula's castle, yet Bram Stoker never visited Romania, his fictional castle was a crumbling ruin, and Vlad the Impaler neither lived nor was imprisoned there; after his 1462 capture he was held in Budapest. The real story starts at a Carpathian pass between Transylvania and Wallachia that worked as a medieval toll booth. In 1211 King Andrew II of Hungary gave...

The people who built the Chrysler Building and danced through the 1920s never called their style Art Deco. They said style moderne or modernistic, and the label only took hold after a 1966 retrospective at the Museum of Decorative Arts in Paris and a 1968 book by historian Bevis Hillier. This episode traces how reinforced concrete freed architects from thick load-bearing walls, starting with Augus...

Built in the early 12th century by the Khmer king Suryavarman II in present-day Cambodia, Angkor Wat originally covered 162.6 hectares and, unlike most Khmer temples, faces west. Scholars debate whether that points to a royal mausoleum, since its bas-reliefs lead visitors counterclockwise as in funeral rites, or to its dedication to Vishnu. Its five towers represent the peaks of Mount Meru, its mo...

In 1850 the organizers of London's Great Exhibition, including Isambard Kingdom Brunel and Robert Stephenson, rejected all 245 design entries and had less than a year left. Joseph Paxton, head gardener to the Duke of Devonshire at Chatsworth House, had studied the ribbed underside of the giant Victoria amazonica water lily. He sketched a glass and iron building on pink blotting paper during a Midl...

Perched on a 650 meter hill in the Homs Gap of Syria, Krak des Chevaliers began in 1031 as a Kurdish garrison placed by the Mirdasid emir of Aleppo, Shibl al-Dawla Nasr, earning it the Arabic name Hisn al-Akrad, the Fort of the Kurds. Crusaders passed it in 1099, and in 1142 Count Raymond II of Tripoli handed it to the Knights Hospitaller, a religious order of healers that had turned into a wealth...

Your elegant drink may be named after an 18th century horse trade trick. This episode breaks down what makes a true cocktail, a base spirit, a modifying agent, and a special flavoring like bitters, and explores the strange theories behind the word itself. We trace mixed drinks from the ancient Greek kykeon to Harry Croswell's 1806 definition, Jerry Thomas's 1862 bartender's guide, the first cockta...

The Philly cheesesteak had no cheese for roughly its first 20 years. This episode follows the sandwich from Pat and Harry Olivieri's hot dog cart near South Philadelphia's Italian Market in the 1930s, where a cab driver's request helped launch Pat's King of Steaks. We cover how cheese arrived around 1951, why Cheez Whiz was added off the griddle in a neighborhood with many kosher-keeping customers...

Do you toast your bagels? This episode explains why some purists call that a crime, starting with the physical science behind a true bagel: low-hydration dough, long cold fermentation, an alkaline boil that forms a gelatinized crust, and a hole that solves a baking problem. We trace the bagel's roots from a 10th century Arabic recipe and the Polish obwarzanek to a 1610 Krakow record, then follow i...

In 1974, scientists opened canned food recovered from the steamboat Bertrand, which sank in 1865, and found no microbial growth. This episode tells the accidental history of canning, from Napoleon's 12,000 franc prize and Nicolas Appert's glass jars to heavy tin-coated iron cans. We explore the Franklin expedition, why the can opener came decades after the can, how World War I rations boosted mora...

The olive oil in your pantry may not be what the label claims. This episode traces olive oil from Neolithic wild olive collection and the Minoan economy of Crete to ancient extraction methods, Spartan athletes, and some truly strange historical uses. We then explain the chemistry of malaxation and centrifuges, why extra virgin olive oil is actually stable enough for frying, how the agromafia fakes...

Does swallowed gum really stay in your stomach for seven years? This episode debunks that playground myth and digs into the surprising story of chewing gum, from a 5,000-year-old piece of birch bark tar found in Finland to modern gum base made with synthetic polymers. We cover how a failed attempt by Santa Anna and Thomas Adams to make chicle carriage tires launched the gum industry, the chemistry...

Why does the tablet spin at the coffee counter feel so awkward? This episode traces tipping from 17th century thieves' cant and the 'drink money' customs of European aristocracy to the American service industry and the modern phenomenon of tipflation. We explore how wealthy Americans imported tipping in the 1850s and 60s, why six states once banned it, how post-Civil War employers and Prohibition...

European chefs in the 18th century tried to copy soy sauce with mushrooms and spices, and failed, because it has to be fermented rather than simply cooked. This episode traces soy sauce back roughly 2,200 years to Han dynasty China, when expensive salt was stretched by fermenting it into jiang paste. The dark liquid that pooled on top of the soybean version became soy sauce, and Buddhist monks lat...

Sake is usually called rice wine, but it is brewed more like beer, and its unusual method lets it reach 18 to 20 percent alcohol naturally. This episode explains multiple parallel fermentation, where koji mold turns starch into sugar while yeast turns that sugar into alcohol in the same vat. We also cover sake rice varieties like Yamada Nishiki, the polishing ratio, how hard and soft water change...

In 1975, a kabuki actor who had been named a Living National Treasure ate four portions of banned pufferfish liver in Kyoto and died hours later. This episode explains why fugu is so dangerous and why people eat it anyway. Tetrodotoxin blocks sodium channels in the nerves, which paralyzes the body while the victim stays conscious, and there is no antidote. The pufferfish does not make the toxin it...

Between 1845 and 1852, ships left Irish ports loaded with grain, butter and livestock while more than a million people starved. This episode explains how that happened during An Gorta Mór. It starts with the middleman system of absentee landlords and ever-smaller subdivided farms, the 1843 Devon Commission's findings, and a population of about 8.5 million, many of whom depended almost entirely on...

What do a Welsh fortress, a Nobel laureate's novel, a Mongolian stone building and a stoner comedy have in common? The name White Castle. This episode uses the Wikipedia disambiguation page for the phrase to show how language stretches over time. It starts with descriptive place names for castles in Wales, Scotland, Ireland, Mongolia and Ukraine, where a pale, visible building served as a landmark...

Falafel is sold cheaply on street corners around the world, yet it has a complicated history. This episode starts with the food chemistry. Chickpeas or fava beans are soaked but never cooked before grinding, so their raw starches set in the hot oil and hold each fritter together. The name has two proposed roots: one runs from Sanskrit through Persian to the Arabic for pepper, the other comes from...