Boston opened the first subway tunnel in the US in 1897

NYC's first subway was built largely in secret

In 1870, Alfred Ely Beach secretly tunneled under Broadway in 58 nights, disguising his pneumatic subway as a mail tube to fool Tammany Hall, the corrupt political machine that ran New York City. Nearly half a million New Yorkers rode it before politics, and a stock market crash killed the project.

Read a complete history of urban mass transit in the United States

Explore the rise and fall of American mass transit, from the horse-drawn omnibus era through the streetcar age to the automobile's dominance. In the 1920s, streetcars carried 12 to 13 billion riders per year. By 1963, that number had shrunken to 300,000.

Toronto's downtown has 18 miles of underground pedestrian tunnels

Known as the "Path," these tunnels have helped reduce pedestrian traffic on Toronto's busy downtown streets for over a century. They were first built by local business owners, prompting a network effect of add-on tunnels.

See inside the Boston Public Library, the first city-run free public library in the US

Founded in 1848, the McKim building opened in 1895 during a period of cultural optimism and social reform. Its Beaux-Arts architecture features marble staircases, murals by John Singer Sargent, and a Renaissance-inspired courtyard.

The first Boston Marathon was held the next year

In 1897, the manager of the US Olympic team organized the first Boston Marathon, which featured a field of 15 runners. The race took place on Patriots Day, a holiday commemorating the first battles of the American Revolution.

45% of Americans have no access to public transit

Most US transit was built on a monocentric design, funneling riders into a downtown center. But today's most common commute is from suburb to suburb, meaning the system is built for a work pattern that no longer exists.

Washington DC's streetcar network built the modern American suburb

Washington's first electric streetcar line launched in 1888, and real estate developers quickly built lines to open new neighborhoods. A 35-minute ride from Chevy Chase, Maryland, to downtown Washington transformed farmland into a suburb.

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

Georges-Eugène "Baron" Haussmann, who oversaw Paris's redesign in the 1800s, replaced many of the city's narrow streets with wide boulevards. This was done at least in part to bring more air and light into the city to help control cholera. Architect Arthur Gilman redeveloped Boston's Back Bay to similarly combat cholera, among other reasons.

The New York MTA is North America's largest transit system

The MTA's FY2026 budget is $21.3B, and the system carried 1.6 billion riders on buses and subways in 2024, making it by far the largest transit network in the country.

America’s first roller coaster initially transported coal instead of people

The Mauch Chunk Switchback Railway in the hills of Pennsylvania wasn’t initially intended to be a ride, but over time passengers and businessmen alike took advantage of the lovely tour through nature. The railway eventually reached over 100,000 riders in some years.

In 1963, a basement renovation in Turkey revealed a passageway to a hidden, multilevel underground city that once housed as many as 20,000 people

The sewage of New York City

Residents of the five boroughs of New York produce 1.3 billion gallons of wastewater everyday. Seventy miles of sewer pipes, first built in the mid-1800s, feed the sewage to 14 wastewater treatment and recovery plants where the waste is treated back to viable, drinkable water. See what shouldn't go down the toilet here.

The Boring Company was created by Elon Musk in 2017

While it started out as a subsidiary of SpaceX, the Boring Company became an independent entity in 2018. Musk started it with the aim of helping reduce city traffic via underground tunnels.

Irish music became popular in the US during the 19th century

The influx of Irish immigrants in the mid-1800s, driven by starvation and abysmal employment opportunities, led to a significant Irish-American culture, especially in urban hubs such as New York, Boston, Philadelphia, Chicago, and San Francisco.

The history of the North American power grid, which is composed of five major grids

Thomas Edison's Pearl Street Station was the first US commercial power plant, burning coal to power lamps for some Manhattan residents. Over time, local power plants would be bought out by larger ones, forming interconnected systems spanning multiple states. Today, the Eastern Interconnection and Western Interconnection are the largest of these systems.

The first recorded worker strike in the United States happened in 1768

That year, journeymen tailors went on strike to protest a wage reduction. By 1794, cobblers in Philadelphia formed the nation’s first trade union, the Federal Society of Journeymen Cordwainers. But that’s just the beginning of labor union history in the US.

In the '70s, graffiti moved to subway cars

Unlike static walls, the silver cars moved throughout the city, like a canvas in perpetual motion. That made them highly desired by graffiti artists, especially because tagging them was considerably more difficult and, in turn, more impressive than a simple tag in an alley.

The bond market dates back to the 1100s in Venice

In the early 1800s, bonds were used to fund US railroads and canals in Great Britain. “Liberty Bonds” were sold during both World Wars in the 20th century. Learning about the early and modern history of bonds can offer a glimpse into how the modern bond market came to be.

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.

15,000 people from over 20 nations lived in these Lower East Side tenements

The Tenement Museum recreated authentic immigrant homes using artifacts from historic buildings that housed diverse communities between 1863 and 2011. Take a digital tour that explores the immigrant experience through carefully preserved living spaces and belongings.

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

Delmonico's was the first American fine-dining restaurant

The steakhouse opened in 1837 in Manhattan, creating what is now considered the first fine-dining restaurant in the United States, introducing gloved waiters, white tablecloths, and an à la carte menu. The establishment also claims it invented a few American staples, including eggs Benedict, which was supposedly named after two loyal customers.

The treadmill was invented as a machine for prison labor

William Cubitt invented the machine in the early 1800s, imagining prisoners, usually two at a time, would use it to grind grain or pump water.

The story of Sweeney Todd was first told in 1800s penny dreadfuls

The demon barber of Fleet Street made his first print appearance between the pages of penny dreadfuls, cheaply made serials filled with grisly tales and sold for a single penny. The tale of Sweeney Todd was published in 18 parts over the course of 18 weeks between November 1846 and March 1847. The series was expanded into 92 parts and later gathered into a single volume published in 1850.

Tokyo is the world's largest city by population

Home to over 41 million people, the megacity used to be a humble fishing village called Edo. Since Japan opened to foreign trade in the mid-1800s, Tokyo has made significant economic advances and achieved numerous milestones in public transportation, urban planning and culture.

A 1954 outbreak at a Boston boarding school allowed scientists to isolate the measles virus

While measles was described as early as the 9th century, humanity lacked the medical technology to fight the disease until the mid-20th century. Vaccine development from the Boston outbreak in the 1960s and 1970s led to one of the most effective inoculation campaigns in history.

In 1915, workers recovered a submarine-like vessel from the Chicago River, prompting fears of German espionage

The word 'dystopia' was first used in 1868

John Stuart Mill, an English philosopher, economist, and politician, uttered the word at the House of Commons while criticizing what he considered to be the government’s insufficient land policy for the Irish, saying, “What is commonly called Utopian is something too good to be practicable; but what they appear to favour is too bad to be practicable.”

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

Mark Twain spent decades feuding with the US Postal Service, convinced its costs and regulations were bureaucratic overreach.

While the first exchange-traded fund (a 'basket' of different assets that can be bought and sold on a stock exchange) in the US only launched in 1993, the global ETF market has grown to more than $10T in the short time since.

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.

Roughly 43 million US borrowers owe roughly $1.7T in student debt, the second-largest source of consumer debt behind mortgages.

Budweiser stores yeast derived from the original 1800s strain in a secret bunker, which only the Head of Yeast Management can access—not even the CEO

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

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

See this overview of the firework rules across all 50 states, ranging from a complete ban on non-professional fireworks in Massachusetts to states with more lax rules like Indiana.

Exploring the Larry Bird punch that almost changed March Madness

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.

In its famous catalog, Sears sold $600 DIY house kits from 1908 through the 1940s, resulting in an estimated 100,000 'Sears and Roebuck homes.'

Quincy Jones' 'Big Band Bossa Nova' helped introduce bossa nova—a jazz-influenced Brazilian genre—to the US

Domino's Pizza's 30-minute delivery guarantee was responsible for the chain's 1980s surge, but it was discontinued after the company was found liable for delivery driver accidents.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight

English mathematician Ada Lovelace wrote the first computer algorithm a century before computers existed and hypothesized that computing devices would one day be able to compose music—foreseeing the generative AI systems of today.

Objects can be 3D printed with light by projecting 2D computerized tomography (CT) scans onto rotating cylinders of resin, which solidify upon exposure.

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

The animatronic shark from Steven Spielberg's 'Jaws,' the first modern blockbuster, was a complex underwater apparatus called 'Bruce.'

Lesser-known phobias include turophobia, or the fear of cheese, and nomophobia, the fear of being without your cell phone.

Bone marrow (soft tissue found inside certain bones) generates roughly 500 billion new blood cells each day