Paris and Boston were redesigned partly to combat cholera's spread

The canal carried germs as well as goods

In 1832, North America’s first cholera epidemic spread inland by way of the Erie Canal, carried by immigrants arriving on ships. Fearful towns barred passengers from disembarking, yet cholera, smallpox, and other diseases still traveled the waterway.

During the Medieval Period, urban populations grew significantly

As workers moved from fields to cities throughout the era, large metropolises of enduring strategic importance were formed from Paris, France, to Baghdad, Iraq.

John Snow—not the one from 'Game of Thrones'—determined that contaminated water sickened London

His pioneering epidemiology work during an 1854 cholera outbreak mapped out the commonalities between people in London who were getting sick. He discovered that ill people were getting water from the same Broad Street pump. Before Snow's work, the prevailing theory was that bad air sickened individuals instead of cholera-causing bacteria in the water.

Boston opened the first subway tunnel in the US in 1897

By the end of the 19th century, nearly 400,000 people were packed into less than a square mile of downtown Boston, with 8,000 horses pulling trolleys through streets choked with noise, manure, and congestion. This prompted the city to pursue a then-controversial subway system.

Washington, DC, was designed by French-born architect Pierre L'Enfant

Pierre Charles L'Enfant was an engineer who fought in the American Revolution. George Washington chose him to design the capital for his military service, artistic training, and vision of a monumental national city.

The Greek city of Alexandria in Egypt helped form the template for modern cities

It was designed by Dinocrates, who studied under Hippodamus, the father of urban planning. Hippodamus preached that urban planning should take into account function, culture, and politics. Dinocrates' design of Alexandria meant applying Hippodamus' teachings on a scale never before attempted.

Often-maligned Brutalist architecture inspired a design renaissance

Despite petitions worldwide to demolish some of its more notorious examples, Brutalism was a transformative moment in architecture. The reinforced concrete style arguably reduced costs, enabled new designs, and reduced the need for maintenance.

The first glasshouse was constructed in 1931

The Maison de Verre in Paris was built to house a doctor's office on the ground level and an apartment upstairs. Unlike the typical model that would follow, this glass house exposed very little of the home's interior.

In the 1930s, New York banned buskers as part of an antinoise campaign

Mayor Fiorello LaGuardia was hoping to modernize the city and believed that street performers only crowded the streets and added to an annoying cacophony. Residents wrote to the mayor to protest the decision, arguing that buskers were appreciated by the public.

Cities and parks often work to prevent graffiti

Although some call it art, many see it as an eyesore and try to prevent it through prohibitive designs, lighting, and vandal-proofed coatings that make spray paint easier to remove. This guide from the Project for Public Spaces outlines some of those strategies and more.

France's first restaurant guide helped spread the concept across Europe and the US

"Almanach des Gourmandes" was published in 1804 and featured restaurant reviews and dining advice, articulating the burgeoning restaurant culture of 19th-century France. The publication helped spread the concept and its values across the map, leading to more formalized restaurants in other countries.

How Monet’s paintings changed the way we see London

Between 1899 and 1901, legendary French Impressionist painter Claude Monet produced over 100 paintings of London consistently shrouded in fog. Art historians claim this series left a permanent mark on how we perceive the capital city, inevitably layered in obscuring and dramatic mist. See some of the paintings and read more here.

Pompeii had cafés, nightlife, public baths, and even local elections

This BBC History guide highlights how recognizably modern Pompeii was, from its cafés and bustling public bathing complexes to its theaters, bars, and active voting culture. Historian Mary Beard reveals the city’s surprisingly contemporary feel.

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.

Portland, Oregon, ran under a commission government for more than 100 years

From 1913 to 2024, Portland operated under a commission form of government, in which five elected commissioners each directly managed their own city bureaus—a structure that was largely abandoned elsewhere in the US by the mid-20th century.

Benjamin Franklin once wrote a satirical essay about passing gas

The Founding Father was asked to judge a contest for the Royal Academy of Brussels, but was incensed by one of the contest's questions, which he believed was highly impractical. In response, he wrote a piece suggesting that the most essential problem for scientists to solve was the "fetid Smell" that came with passing gas.

Jane Austen was unhappy in the city of Bath, but it inspired some of her books

In 1801, Austen's father retired and abruptly moved the family from Steventon to Bath. Austen loathed her new home, but she used it as the setting for pieces of her novels "Persuasion" and "Northanger Abbey." "The scandals and shallowness of the city fueled her cynicism and wit; nothing escaped her scathing pen," an exhibition on Austen from the Bath Preservation Trust explained.

The 15-minute city lets residents meet their daily needs within 15 minutes on foot

Many cities have been designed with inefficient layouts that waste time and lower the quality of life of those who live there. In the 15-minute city, essential services—including work, food, education, and health—should all be located within a short walk or bike ride from where people live.

During the COVID-19 pandemic, readers returned to Camus' 'The Plague'

The 1947 novel, about a city in Algeria that enacts a city-wide quarantine to battle a deadly outbreak, captured readers' attention in the early months of 2020. In the UK, over 2,000 copies of the book were sold in March of that year, over six times what it had sold the month before.

During COVID-19, New Orleanians turned their houses into floats

After the 2021 Mardi Gras parades were canceled, New Orleans resident Joy Boudreaux joked on social media that residents should turn their homes into floats. They followed suit and interested (socially distanced) revellers followed maps of participating homes.

The aging electrical substations of Saigon

One of the overlooked influences of French colonialism in Vietnam lies in the capital city Saigon’s electrical infrastructure. Though France withdrew in the 1950s, many of the colonial-era substations built by the French company Compagnie des Eaux et Électricité are still operational today. Scroll through the article for images of these substations and an overview of their history.

IBM helped turn Rio de Janeiro into a smart city before it hosted the World Cup

In response to the deadly floods and mudslides in 2010, Brazil and IBM developed a multimillion-dollar plan to modernize Rio's emergency management infrastructure. An operations center utilizes advanced weather forecasting, surveillance, and real-time data to surveil and respond to events such as severe storms more accurately.

'Leaves of Grass' was banned several times for obscenity

Whitman's collection was banned numerous times in various cities through the 1800s; in Boston, the district attorney even threatened Whitman’s publisher with criminal prosecution.

Poison ivy was sent to Europe in the 1600s as an exotic, ornamental oddity

The plants were grown in the English royal gardens at Kew, the Faculty of Medicine in Paris, and a few other locations.

The peer support movement may date back to 18th century France

At the Bicêtre Hospital, an asylum near Paris, Jean-Baptiste Pussin (who had previously been a patient but later led the hospital administration) tried to hire as many staff as possible from among recovered patients. Chief physician Philippe Pinel found these individuals to be kinder than other staff and "averse from active cruelty" which was common at the time. This approach allowed the facility to move away from shackling patients and other violent methods.

Santa Barbara once had a thriving Chinatown and Japantown

In the late 1800s, the city had an influx of immigrants from China and Japan, prompting the growth of areas dominated by their respective cultures. Earthquakes and world wars, as well as a push for Spanish Colonial architecture, led to their eventual decline.

At the beginning of the 20th century, a group of young men ate standard American food—replete with food additives like borax and formaldehyde—as part of government research to better understand food safety.

After the Boston Tea Party, colonists switched to coffee, which became the main morning drink for revolutionaries.

During the French Revolution, a botanist's letter asking about "dear Rhus" (poison ivy) was intercepted, leading authorities to suspect he was conspiring with the Russians.

When a Paris department store hesitated to sell Estée Lauder's perfume, she 'accidentally' broke a bottle, causing the smell to spread throughout the store and shoppers to start asking to buy the scent.

Graffiti dates back to at least ancient Pompeii, where citizens scrawled messages to one another on public walls

Hotels in Cannes, the glamorous city on the French Riviera, hire hawks to ward off seagulls during the city's famous film festival.

Louisiana's 'Cancer Alley' is infamous for having some of the highest industrial pollution, toxic air emissions, and cancer risks in the US.

Before the current East Wing ballroom project, only two White House renovations in the past 100 years cost more than $10M.

Before writing 'Walden,' transcendentalist Henry David Thoreau nearly burned down his hometown with a campfire that grew out of control.

American dance legend Martha Graham, sometimes called 'the Picasso of dance,' refused to perform at the 1936 Olympics in Berlin and conceived the piece 'Chronicle' in response to the experience.

Mid-century modern graphic designers, known for their bright colors and bold lines in advertising, also found success with children's books.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

The concept of phantom limbs, the perception that amputated limbs are still present, dates back to a French military surgeon in the 16th century.

Cultural norms about how to handle the bodies of loved ones in communities in West Africa have hampered Ebola responses.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Abraham Lincoln was almost assassinated weeks before his inauguration as he traveled from Illinois to DC through Baltimore in 1861; it took two independent claims for Lincoln to be convinced the threat was real

Massive 3D printers have been used to build homes by stacking layers of 'concrete toothpaste,' a fire-resistant material that effectively insulates against outside noise.

Fireworks-related ER visits are on the rise—in 2024, they increased by 52% as compared to the prior year.

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.

Some Pokémon have been named after real and fictional organisms, while some real-world species have been named after Pokémon, such as Chilicola charizard and Binburrum zapdos.

Doctors differentiate between a phobia and fear by asking patients whether their fear interferes with their day-to-day activities.

The term 'algorithm' originated from the Latinized name of al-Khwārizmī, a 9th-century mathematician whose works introduced Arabic numerals and the decimal-based numeral system to Europe and whose treatise 'Al-Jabr' gave algebra its name.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.