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The European green woodpecker was one of the most skittish birds observed.

Urban Birds Seem to Be More Fearful of Women Than of Men—and Scientists Don’t Know Why

The study examined 37 bird species in cities across five European countries. The animals allowed men to get about three feet closer than women, on average, before flying away

Hammarby Sjöstad was originally engineered to have a carbon footprint 50 percent lower than the rest of Stockholm.

This Stockholm Neighborhood Was Built on Ambitious Sustainability Goals. When It Came Up Short, It Doubled Down and Became a Blueprint for Others

The original plan for Hammarby Sjöstad was for an eco-village aimed at attracting the Olympics. They never came, but the locals moved in and, with upgrades, hope to be carbon neutral by 2030

Gustave Eiffel at the Eiffel Tower in 1889

A Dizzying Spiral Staircase With a Single Guardrail Once Led to the Top of the Eiffel Tower. Now, You Can Buy 14 of the Original Steps

The 1,062 steps connecting the tower’s second and third levels were installed in 1889. Fragments from the 137-year-old staircase can be found at several French museums

The escalator opened to passengers on February 17, 2026.

The World’s Longest Outdoor Escalator Just Opened in China. Riding the 3,000-Foot-Long System to the Top Takes More Than 20 Minutes

The new “Goddess” escalator in Wushan County features 21 individual escalators and 8 elevators. The modular design carries riders up 800 feet in elevation

The completed model takes up roughly 1,350 square feet.

A Truck Driver Spent 20 Years Making This Astonishing Scale Model of Every Single Building in New York City

The 1,350-square-foot model is now on display at the Museum of the City of New York, where visitors can use binoculars to see tiny replicas of all five boroughs

Barcelona

Coastal Cities of Europe

Coastal Cities of Europe

Explore the history, culture and natural wonders of the continent’s most celebrated ports

The Polar Bear Swim in Vancouver in 1978. Lisa Pantages, second from the left, will complete her 64th annual plunge this New Year’s.

‘Excitement With a Little Dash of Fear’: Polar Plunges Ring in the New Year With a Splash. But What Actually Happens to Your Body?

Three experts share the science behind taking a dip in cold water—and offer safety tips that any potential plungers should bear in mind

Dark-eyed juncos are small sparrows found throughout North America.

These Urban Birds Evolved Longer Beaks During Covid-19 Lockdowns. Then, They Changed Back

Researchers suspect that dark-eyed juncos living in Los Angeles adapted based on the availability of food scraps tossed by humans

The new Banksy artwork near the Centre Point tower in London

Banksy Unveils Two New Murals of Children Gazing Up at the Sky Days Before Christmas

Some onlookers are interpreting the identical artworks, which appeared on the streets of London, as a commentary on homelessness in the city

Sales of the MetroCard will end December 31.

The Era of the New York City MetroCard Is Almost Over. Say Goodbye to the Iconic Yellow Passes With a New Exhibition

As the Metropolitan Transit Authority moves to a contactless, tap-and-go payment system, “FAREwell, MetroCard” allows visitors to learn more about the history of the long-running fare card

A raccoon peers out from a tree. New research suggests urban raccoons in the United States have shorter snouts than rural raccoons do, a sign of potential domestication.

Urban Raccoons Are Showing Signs of Early Domestication, With Shorter Snouts Than Their Rural Cousins

The shorter faces of these city-dwelling trash bandits offer a telltale sign of domestication and line up with a leading hypothesis about animals that adapt to human-dominated environments, according to a new study

Boise Whitewater Park includes two adjustable wave features spread over a mile apart. The first is suitable for those beginning to surf, while the second phase is better for advanced levels to put on a show.

Rooted in the American West: Food, History and Culture

How Landlocked Idaho Became a Leader in Urban Surfing

Boise’s wave park is attracting outdoor adventurers—and the innovative public works project is inspiring other cities

A company called Roofscapes has installed an experimental green roof over a zinc one at the Academy of Climate in Paris. A wooden platform, dotted with planters, runs along the building’s side, creating a terrace.

The Skyline of Paris Is Filled With Zinc Rooftops. But Can They Survive Climate Change?

Innovations are overdue, as the signature blue-gray metal roofs heat up in high temperatures, making living conditions in the apartments beneath them unbearable

Isaque Carvalho Borges won $12,500 in the Central and South American category of the 2025 Earth Prize, the world’s largest environmental sustainability competition for students between 13 and 19 years of age.

This 16-Year-Old Invented an A.I. Tool to Help Cool Down the World’s Hottest Cities

Isaque Carvalho Borges experiences the urban heat island effect in his home of Palmas, Brazil, and he wants to do something about it

Coins left behind as offerings helped the researchers measure the size of the imprint from photos.

Chicago’s Famous ‘Rat Hole’ Wasn’t Actually Made by a Rat, According to a Statistical Analysis

Scientists are almost certain the viral imprint in a city sidewalk was actually made by an unlucky squirrel

The hunt includes around $10,000 worth of treasures, with individual prizes ranging from $300 to $3,500.

A Real-Life Treasure Hunt Is Underway in These American Cities

Stack’s Bowers Galleries is hiding certificates for rare coins and banknotes this month as it celebrates the 90th anniversary of its first auction in October 1935

According to new research, the Chicago River has become significantly cleaner and healthier in recent decades. 

Fish Are Spawning in the Chicago River, Another Sign the Once-Contaminated Waterway Is Rebounding

A new study suggests at least 24 species of fish are reproducing in the urban river, adding to the evidence that it is getting cleaner and healthier

Scientists are eager to figure out why lead doesn't seem to affect brown anoles.

These Lizards Have So Much Lead in Their Blood, They Should Be Dead. Instead, They’re Thriving

Brown anoles around New Orleans have the highest blood concentrations of lead ever recorded in vertebrates—and scientists aren’t sure why they can survive it

The American robin was among the birds most affected by light pollution.

Light Pollution Is Making Days Longer for Birds, Extending the Hours When They’ll Sing

A new study looked at millions of recordings of birdsong and found that some species in areas with more light pollution are active for almost an hour longer than average

Apps like the newly launched Runmates provide links to running clubs worldwide.

Third Places Are Being Reimagined—and Welcoming Travelers in the Process

Outside of home and work, spaces like parks, food halls and libraries are stepping up with social offerings

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