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If you crossed London Bridge in the 1600s, it wouldn't have looked much like a bridge from the roadway. Buildings crowded both sides, shops opened onto the narrow street, and some upper floors even stretched across the road above people's heads.

The stone bridge completed around 1209 developed into one of London's major shopping streets. Research into surviving leases and property records shows that the bridge houses were commercial buildings, with shops on the ground floor and families living above them. At one point, more than 500 people lived on the bridge itself

By the 18th century, that arrangement had become increasingly awkward for traffic. Parliament authorized the removal of the buildings in 1756, demolition began the following year, and by 1761–62 the inhabited bridge had essentially vanished. The bridge remained, but the strange little street suspended over the Thames was gone.

The view below is from 1616. Almost everything that looks like an ordinary row of waterfront buildings is actually standing on London Bridge.

Boa Sr lived in India’s Andaman Islands and was the last fluent speaker of Aka-Bo, one of the Great Andamanese languages. By the final years of her life, there was no one left with whom she could hold a conversation in her mother tongue

Linguist Anvita Abbi and her research team recorded Boa Sr’s speech, stories and songs before she died. She remembered material that other surviving Great Andamanese people could no longer understand, which meant some parts of the language survived only because they had been documented

Boa Sr died in Port Blair on 26 January 2010, at about 85 years old. With her death, Aka-Bo lost its last fluent speaker. The Endangered Languages Project now lists the language as dormant

One detail often repeated online is that Bo itself was “65,000 years old.” That is much harder to defend linguistically, so I’d leave it out. What is well established is simpler, and probably more striking anyway: a language that had once been spoken by a whole community ended with one person who had nobody left to speak it with.

On 29 August 1930, the remaining 36 inhabitants of St Kilda boarded HMS Harebell and left the remote Scottish archipelago for the mainland. This wasn't a forced evacuation. Earlier that year, the islanders themselves had petitioned the British government for help leaving because their shrinking community could no longer support itself

Life on Hirta, St Kilda's main island, had always been unusual. Generations survived through small-scale farming, livestock and especially harvesting seabirds and their eggs from the enormous cliffs surrounding the settlement. Historic Environment Scotland describes human occupation there stretching back about 4,000 years

By the early 20th century the population was falling, younger residents were leaving, and the islanders had become increasingly dependent on imported food, fuel and building materials. After the 36 people departed in 1930, the old permanent community never returned. The abandoned village, stone houses and hundreds of small storage buildings called cleitean are still scattered across Hirta today

It is strange to look at photographs of the islanders knowing that this wasn't an archaeological civilization or some distant medieval settlement. Some of the people in these photographs lived long enough to see cars, television and commercial air travel become ordinary, while the community they were born into had completely disappeared.

Çatalhöyük in central Anatolia doesn't look much like our idea of an early town. Beginning around 7400 BCE, people built mud-brick houses packed directly against one another. There were essentially no ordinary streets running between them.

Instead, much of the movement happened across the rooftops. People climbed down into their homes through openings in the roof using ladders. Inside were ovens, storage areas and raised platforms used for sleeping and other daily activities. Some of the dead were also buried beneath floors and platforms inside the houses.

The settlement was rebuilt again and again in the same place. UNESCO has identified 18 Neolithic occupation levels on the eastern mound, dating roughly from 7400 to 6200 BCE, with later Chalcolithic occupation continuing on the western mound.

So for generations, a normal trip to a neighbour's house may have meant climbing onto your roof, crossing above several other homes, and descending through a hole in somebody else's ceiling.

Long before electricity, wealthy households and government buildings across colonial India stayed cool using a "punkah" — a large cloth-covered frame hung from the ceiling, swung back and forth by a rope to move air around the room. Someone had to actually pull that rope, for hours at a stretch, and that person was called a punkah-wallah ("wallah" being a Hindi/Urdu suffix roughly meaning "the person in charge of").

Because a punkah-wallah sat in the room all day, within easy earshot of everything being said, some British employers specifically sought out servants who were deaf, so they could discuss confidential business without worrying about being overheard. Other households solved the same problem differently: they ran the rope through a small hole drilled in the wall near the ceiling, so the punkah-wallah could sit in the next room, or even outside the house entirely, and never be in the same space as his employers at all.

It was considered one of the lowest-status jobs in the household staff hierarchy, usually filled by people from lower castes who'd often previously worked as sweepers or palanquin-bearers. As punkahs started running through the night too (so employers could sleep comfortably), workers were split into overnight shifts, sometimes lying on their backs and pulling the rope with a foot to save their arms over a long shift. Falling asleep mid-shift could bring serious punishment from an employer.

The whole profession disappeared fast once the electric ceiling fan reached India in the early 20th century — no wages, no shifts, no risk of dozing off. You can still see punkahs hanging, motionless, as decoration in some restored colonial-era buildings today. The job of the person who used to pull them by hand, all day and all night, simply doesn't exist anymore.

In 1899, a woman named Fanny Cochrane Smith stood in front of an Edison phonograph at the Royal Society of Tasmania and sang into it. She did another session in 1903. Those eight wax cylinders are, to this day, the only audio that exists of any of the original Tasmanian Aboriginal languages being spoken or sung by someone who actually grew up speaking it.

In the early 1960s, the Aral Sea, sitting between what's now Uzbekistan and Kazakhstan, was the fourth-largest lake on Earth. It was fed by two rivers, the Amu Darya and Syr Darya, and supported a fishing industry employing tens of thousands of people in towns along its coast.

Then Soviet central planners decided the desert around it should grow cotton instead. Starting in the 1960s, they built a massive network of irrigation canals that diverted almost all the water from those two rivers away from the sea and into cotton fields. This wasn't a miscalculation nobody saw coming — Soviet officials had been calling the Aral a "useless evaporator" since at least the early 20th century, and by 1968 a Soviet water engineer said outright that its evaporation was inevitable and obvious to everyone. They ran the math, decided cotton was worth more than the sea, and kept the canals running anyway.

By 1997 the Aral had lost about 90% of its water and split into separate, shrinking lakes. The town of Moynaq, in Uzbekistan, used to be a fishing port sitting directly on the coastline. Today the nearest water is over 100 km away, and the old fishing fleet never went anywhere — it's still sitting exactly where the water left it, rusting in what's now just called the Aralkum desert. People visit it as "the ship graveyard."

There's one partial silver lining: a dam finished in 2005 with World Bank funding has let the smaller northern part of the Aral Sea (in Kazakhstan) refill somewhat, and fishing has genuinely restarted there. But the larger southern sea is essentially gone for good, and the single vast lake that existed before the 1960s simply doesn't exist as a shape on a map anymore.

Scattered across churches in southwestern France, you can still find these small, separate doors — often less than four feet tall, tucked off to the side of the main entrance, some now bricked over. They weren't for storage or deliveries. They were the only door a specific group of people, called Cagots, was legally allowed to use to enter the building.

Here's the strange part: nobody could actually tell a Cagot apart from anyone else. They weren't a different ethnicity, didn't speak a different language, and were devout Catholics just like their neighbors. And yet for something like 800 years, in parts of the Pyrenees, Béarn, Gascony, and even up into Brittany, they were treated as a hereditary caste of untouchables. They had to enter church through that separate door, sit in segregated pews at the back, use their own holy water font, and receive communion at the end of a long stick or spoon so the priest wouldn't have to touch them. They were often required to wear a red goose-foot or duck-foot badge sewn onto their clothes, and were restricted to a narrow set of trades — mostly carpentry and woodworking, since "land, fire, and food" trades were considered off-limits to them.

Historians genuinely don't agree on why this started. Over the centuries people have guessed they were descendants of lepers, defeated Visigoths, Cathar heretics, or Moorish soldiers — but none of these theories are actually confirmed, and the earliest surviving records (from around the 11th–13th centuries) already treat Cagot status as simply hereditary, with no explanation given. The discrimination was never an official royal or church policy — popes and kings occasionally spoke out against it — but it kept getting re-enforced at the local level anyway, village by village, for centuries.

Legal equality technically arrived with the French Revolution in 1789, but the social stigma lingered in some villages well into the 1800s, and only really faded out by the early 20th century. Today there's a small museum devoted to Cagot history in Arreau, in the Hautes-Pyrénées — but the most visible trace of all this is still just those doors, quietly built into church walls that people walk past every day.

For much of the 1800s, ice wasn't something you made. In New England, it was something people harvested.

Workers cleared snow from frozen lakes and ponds, scored the ice into grids with horse-drawn cutters, sawed it into huge blocks, and moved those blocks into insulated icehouses. Packed tightly with materials such as sawdust or straw, the ice could survive long after winter ended.

Boston merchant Frederic Tudor helped turn this into a serious international business. New England ice was shipped not just around the United States, but across oceans to places including the Caribbean and India. Somehow, blocks cut from frozen Massachusetts ponds could end up cooling drinks thousands of miles away in a tropical climate.

Natural ice harvesting eventually lost out to manufactured ice and electric refrigeration. What had once required frozen lakes, horses, saws, enormous warehouses and seasonal crews slowly disappeared as a major industry.

New York started using pneumatic tubes for mail in 1897. Postal workers packed letters into metal canisters and sent them through a network of tubes using compressed air and suction. The canisters could carry hundreds of letters and travel at roughly 35 mph.

By 1898, the system connected 21 Manhattan post offices with the main post office. And this wasn't some tiny experiment that disappeared immediately. As late as 1914, around 30% of the first-class letters handled by New York's main post office were traveling through the tubes. A journey that could take a mail wagon 40 minutes could sometimes be done in about seven.

Cars and trucks eventually made the fixed underground network less useful, and moving post offices or changing routes was obviously much harder when your infrastructure was buried beneath the streets. The system survived, with interruptions, until New York finally ended pneumatic mail service on December 31, 1953.