In 2024, Walden Pond was listed as an endangered place

Tourists flock to Walden Pond from across the globe

The pond and its surrounding land were privately owned until 1922, when they were deeded to Middlesex County. (Later, management was handed over to the state of Massachusetts.) Thanks to Thoreau's "Walden," the pond has become a popular tourist destination, welcoming over 600,000 annual visitors, with roughly 160,000 of them from outside the United States.

See the plot of land where Thoreau built his Walden cabin

Harvard's Lawrence Buell takes viewers down to Walden Pond to show them the spot in the woods where Thoreau constructed his modest cabin. Along the way, he reads from "Walden" and explains why Thoreau's text still matters 170 years after its publication.

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

Busting the myths about Thoreau's 'Walden'

This resource from The Walden Woods Project dispels some of the common myths about Thoreau's time in the woods, including that he was a hermit (he actually regularly visited friends), that he was freeloading (he paid off his debts), that "Walden" was a misrepresentation (he was forthcoming about editing his experiences), and that he was opposed to progress (he believed in practical technology).

How one professor uses 'Walden' to study climate change

Richard Primack, a biology professor at Boston University, uses observations on Walden Pond's ecology from Henry David Thoreau's book to inform his study of climate change, noting that "Walden" is one of the oldest datasets available in the United States.

Read the books of Henry David Thoreau

Thoreau's books are all in the public domain, which means they're free from copyright—and free for you. Project Gutenberg has the landmark text "Walden," as well as lesser-known works such as "A Week on the Concord and Merrimack Rivers" and "The Maine Woods."

The political theory of Henry David Thoreau

The two years, two months, and two days that Thoreau spent living in a modest cabin at Walden Pond informed his beliefs that people should live simply, deliberately, and become self-reliant. Those beliefs were later articulated, in a political sense, in his landmark essay, "Civil Disobedience."

Well before the publication of 'Walden,' Henry David Thoreau nearly burned down his hometown

On April 30, 1844, the transcendentalist set a campfire that quickly grew out of control, burning 300 acres of woods near Concord, Massachusetts. For years, Thoreau remarked that other residents called him the "woods burner." Thoreau, though, felt no guilt, writing in 1850, "It has never troubled me from that day to this more than if the lightning had done it."

Taliesin offered Frank Lloyd Wright an oasis away from gossip and scrutiny

After a public affair that damaged his reputation, Frank Lloyd Wright built a hideaway for himself and his mistress. This grand Wisconsin structure is now a National Historic Landmark after experiencing two major fires, each followed by major renovations.

William HH Murray spurred American interest in rustic retreats

Murray's 1869 self-help book, "Adventures in the Wilderness; or, Camp-Life in the Adirondacks," encouraged urban residents to embrace outdoor activities, depicting upstate New York as an unsullied paradise free from the chaos of city life.

The real stories behind America's national parks

The history and impact of national parks is complex. The authors of "Olmsted and Yosemite: Civil War, Abolition, and The National Park Idea" curated this list of nonfiction books examining American national parks from a variety of perspectives.

Explore how close you live to some of the most contaminated places in the US

Known as Superfund sites, these toxic locations undergo long-term cleanup to remove hazardous waste, protect health, and restore land for safe reuse. As of 2025, the EPA lists around 1,300 active Superfund sites on its National Priorities List, with more than 450 cleaned and removed since 1980.

Photographing abandoned structures in the southeastern US

Leland Kent is a photographer and historian who has captured hundreds of buildings across the southeast United States over the last 10 years in order to preserve the past before it's too late. His subjects include decommissioned power plants, closed youth jails, vacant plantation homes, and more, and he has published several city-focused books. Get lost in Kent's dramatic portrayals of once-lively structures in this extensive and gripping gallery.

An inventory of ancient trees in the United Kingdom

The world is filled with trees that are hundreds—if not thousands—of years old, and the UK's Woodland Trust believes each one deserves the same protections great cathedrals and castles receive. This active database invites users to peruse...

The efforts to save the wild turkey

An essential character in American tradition, the wild turkey is more than just the meat you eat on Thanksgiving. Listen to this four-part miniseries to learn what they symbolize, the long-lasting efforts to preserve this bird, and why their conservation matters.

Agricultural land remains mostly unchanged after wind projects

From 2012 to 2020, less than 0.05% of available US farmland had commercial wind turbines installed. More than 95% of this land lacks wind farm structures such as turbine pads or roads, leaving most cropland and pasture-rangeland unchanged.

Frank Lloyd Wright's houses are historically hard to sell because they're old, subject to local landmark commissions, and often unfashionable

Biosphere 2 revealed limitations in maintaining wildlife in unfamiliar environments

Trees appeared to become weak and more prone to breaking because a lack of wind caused them to no longer need to develop stress wood. The extinction of pollinators—potentially due to an explosion in the population of longhorn crazy ants—was also unexpected.

Nikola Tesla's original laboratory was recognized as a historical site in 2018

Beginning in 1901, the Wardenclyffe Tower was built on Long Island, New York to transmit electrical power through Earth's atmosphere. The project was abandoned before becoming operational due to limited funding, and was demolished for scrap in 1917 to help pay off Tesla's debts.

The symbol of the American lawn

Trimmed, pure green lawns are the norm in US yards and require regular mowing, fertilizing, and weed whacking to keep in order. They are cherished for their simple aesthetic and as a soft area for walking or playing near the house. Still, they are also so-called monoculture zones with only one plant species, lacking biodiverse resilience. This article traces the history of the lawn in America and the contemporary debates over its future.

Kitty Hawk’s wide space, isolation and winds were ideal for flight experiments

North Carolina’s Outer Banks at the turn of the 20th century were not the summer resort destinations they are today. The brothers sought privacy as they toyed with their aviation designs, camping in Kill Devil Hills and using its sand dunes as launch points for early glider designs.

National Geographic's list of best places to visit in 2023

National Geographic has released its latest Best of the World list with 25 must-see destinations for 2023 from Alberta, Canada, to Busan, South Korea.

Henry Ford once ran a failed rubber plantation in Brazil's Amazon Rainforest

In 1927, Henry Ford bought 2.5 million acres of land off the Amazon River in Brazil, with the intention of creating an American-style Ford factory to produce the rubber needed for tires. The development, known as Fordlandia, was never able to produce enough rubber, and Fordlandia was officially shut down in 1945.

Fenway Park is the oldest professional baseball stadium in use

The legendary park was built in 1912 and is considered hallowed ground for baseball fans, along with iconic venues like Yankee Stadium in the Bronx and Wrigley Field in Chicago.

Why Japan builds airports on water

Some of Japan's roughly 100 airports are built on water—that is, engineers have created new land in bodies of water specifically to construct airports. This six-minute video explains why the country is doing so despite the higher cost of such airports.

There is a secretive bomb-proof bunker located under the White House

Built in 1942 during World War II, the Presidential Emergency Operations Center lies beneath the East Wing. Designed to protect the president during air raids—and later nuclear threats—it remains a top-secret command site used during crises like 9/11.

The billion-dollar ghost town in Baltimore

As a Rust Belt city looking to revitalize its economic core, Baltimore, Maryland, sought big investments from developers and municipalities. The so-called Baltimore Peninsula is a billion-dollar neighborhood in south Baltimore initially prompted by the investment of Under Armour CEO Kevin Plank. In 2025, the glossy, grand urban neighborhood is still empty, with fully-built condos and retail spaces.

The idea for the Federal Reserve was conceived in secret in 1910—with bankers donning duck hunt gear for disguise while traveling to a remote country club on Georgia's Jekyll Island

An investigation suggests a Scottish island became awash in forever chemicals via seafoam and seaspray—raising questions about what that means for the safety of other coastal areas.

In 2009, the nation was gripped by the story of a missing young boy who was believed to be floating over Colorado in a homemade balloon, until it was revealed that he was at home the whole time.

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

Famed poet TS Eliot rejected the manuscript for George Orwell's political fable 'Animal Farm,' writing that its criticism of authoritarianism was not 'the right point of view.'

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

NBA superstar Victor Wembanyama spent the 2025 summer training with monks in central China to enhance his body and mind.

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

The boiling temperature of water decreases with increasing elevation because the molecules need less energy to overcome the lower atmospheric pressure associated with thinner air.

See photos of Meteora, a mountainous site in central Greece, home to 14th-century monasteries perched atop soaring outcroppings.

After NASA's Voyager 1 captured Earth as a single pixel as it left the solar system in 1990, astronomer Carl Sagan used the image to reflect on humanity's fragility and the responsibility to protect 'the only world we've ever known.'

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

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.

Experimental hantavirus vaccines and therapies, still under development, have long been funded by the US military.

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," resulting in countless memes, the creation of a music festival, and eventually the arrests of those who did try to approach the area.

Warren Buffett's former professor Benjamin Graham is known as the 'father of value investing,' a strategy in which investors seek to buy stocks trading below their intrinsic worth.

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment

See how Budweiser's famous Clydesdales spend their days at Warm Springs Ranch, where roughly 70 to 80 of the beer brand's giant horses can be found at any given time.

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

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

Explore a list of the 100 best novels of all time, compiled by some of the world's best living writers, including Salman Rushdie, Stephen King, and Jennifer Egan.